With 30000 men, you won't stand a chance against mongols.
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With 30000 men, you won't stand a chance against mongols.
Your confidence is overwhelming :laugh4: I still have a full century to prepare. I'm still expecting to lose but getting my dynastic ties so deeply ingrained with my neighbors has given me some reliable allies, which i fully intend to keep.
It's gonna be world war one and win or lose I'm gonna have a blast!
you guys really give too much credit to the mongols
chose ground wisely, preferably near the water (since you can avoid attrition that way while on water :P), if not possible then doomflank on a mountain county preferably with a rivercrossing.
theyll bring what? 60k? you can take that np if you play smart
So I just took the plunge since it's $20 on amazon. What ruler or country do you guys recommend for starting? Is the tutorial any good? I'm going to really dig in over the weekend but some direction would be welcome.
To start out you might want to be an Irish county. That will prevent you from getting overwhelmed. When you feel confident enough to be a King, I would suggest either Sweden or Poland. Both have pagan neighbors which will get you an introduction to warfare, and both have a decent number of vassals but not to much.
or if you like spain, take the duchy of barcelona, nice one to start with, allthough i dont know what differences the new patch have made for their starting position in 1066. i think it might be alot harder as them now, so in that case ireland would be good.
Welcome to the game ATPG! :grin2: The tutorial is fine and will get you comfortable with the UI, how to declare war, how to use plots, and so on. But beyond that it's not much help. Like any Paradox game you're going to need to run some training campaigns to get a good feel for all of the mechanics. Until you learn more about the mechanics don't worry about losing, instead only concern yourself with learning and having fun.
Sweden is a relatively poor (in terms of money) game. I consider it more advanced solely due to the fact that if you don't manage yourself smart in the early game, by the mid-game you're broke and essentially not much of a threat to anyone. If you want my advice go Ireland first and foremost. Any of the counts there will introduce you to the absolute basics of character relations. You will learn the hard way of what to do/not to do, this thread also has helpful tips for anyone new to the game :yes: You willl also have the chance to form duchies and later the Kingdom of Ireland with very little outside hindrance. It's a great training sandbox.
After you feel comfortable I would follow Stranger's advice and go to Spain. Any of the Jimena brothers offer a great game for someone trying to learn more how to play. Iberia will teach you the intricacies of the character relation system, it's there you'll learn about multi-faction wars, title claimaints, de jure duchy importance and so on. Poland is also a good choice when your understanding of the game is intermediate and you want to get a bit deeper into things.
Catching them on favorable terrain for your side is really the key. If you fail to do so their free 20k attrition proof doomstacks will get ya, which is what I am afraid might happen. It can be easy to get caught out of position on the eastern side of the map and facing down an attacking force on even terrain. Not something I want to do with the Mongols. :no: But if I keep my coalition alive and continue to strengthen my levy pools it'll be a fun fight if nothing else. ~;)Quote:
you guys really give too much credit to the mongols
chose ground wisely, preferably near the water (since you can avoid attrition that way while on water :P), if not possible then doomflank on a mountain county preferably with a rivercrossing.
theyll bring what? 60k? you can take that np if you play smart
It's alright, my Chancellor eventually fabricated a claim on Salerno, which I seized with both hands! The real difficulty in claiming the rest is that Genoa has rooted in deep and they're more capable of spamming mercenaries than I am.
My dynasty has moved onto it's third character now, which looks to be a tough ask since he's only sixteen and heavily reliant on his uncle. Still, his demesne includes the Kingdom of Trinacria and Naples (titular only, heh), the Kingdom of Sicily (save Apulia) and the Kingdom of Africa (rather, Tunis and Tripolitania, both given to me by the Pope for a successful crusade).
My cousin currently holds Jerusalem, having inherited from his father, who was the third son of my starting character; he's managed to fend off some attempts to reclaim the land (both de jure claims and jihad), but I'm unsure how long he can hold off against the Caliphate. Still, it's good to see my dynasty name stretching across various parts of the Med. :P
Man, appointing an antipope lets you rake in the cash. In the early-game, when I only controlled 5 counties, my income jumped from 3.75 gold/month to 18 gold/month, simply from all those taxes my bishops had been evading.
Also, a question for you guys - is it possible to change your capital city (e.g. from a castle to a town)? I ask because I'm fairly certain that I only receive full taxes from holdings that I personally own, and if I try to add a city to my demense when my capital is a castle I get a major penalty.
I think it is possible, but I think you will still get the penalty. and it wont net you more cash. the -30 wrong type bonus is negligble for the money you get anyway.
Guess I had a rough start then. I started as the byzantine duchy of Anatolia. After a while the civil strife began, and I was wondering: How come they get so many units? I wanted to be a loyalist, but the emperor didn't seem to care about me and the usurpers started to occupy my land. I was forced to declare war on the emperor. I really hated the game after that, but my next game was as the Komnenoi of Paphlagonia. I'm happy I didn't quit the game.
I was under the impression that you can only change capital across counties (say, from Reggio to Palermo as I have done), rather than between the county's holdings (castles, cities and churches)?
Besides, castles are supposed to be the main holding in any feudal lord's territory; the only occasions where this is not the case is for bishoprics such as Mainz and grand cities like Venezia.
yes but if you change it to a county where your primary (only) holding is a city, you can thus make your capital a city. it requires some work tho... and its not worth it
Holy cow this is fun. I'm playing Ulster as my first campaign, I'm on my second Count, a 19 diplomacy ~15 steward just/gregarious/kind total coward (craven). His wife is 15 diplo 10 steward and the heir to a near by (but not neighboring) county (her dad had a rebellion and is now a Cathar heretic). Not sure what happens when he kicks the bucket - I assume I end up having control over it, right?
Anyway, I forged a claim on Tyrone and I'm building up my levy buildings to get a healthy lead over them, but it's slow going. I'm also worried about giving my marshal troops - he's level 12 mil but he's my brother and a pretender to the throne. With my diplomatic super powers he's only ~-30 relations. Can he steal my troops to seize the throne?
Also I have two daughters, the first (my heir) is a bona fide genius.
SO GOOD
If your wife inherits then she will become a landed character, as in she'll rule from that county and have her own court, ect. You won't get the county but if you've been popping out children there's a good bet your number one heir will get her county along with inheriting everything you have. Unless you're running gravelkind succession in which case it's a bit more complicated.Quote:
Originally Posted by Alexander the Pretty Good
No nothing like that. He cannot steal your troops while in command of them. But there's nothing stoping him from using his own personal levies when/if he rebels. In fact, putting guys who hate you at the head of weak armies is a good way of getting them killed and removing them as a threat. Provided you can spare the loss of the men who die with them, of course.Quote:
Anyway, I forged a claim on Tyrone and I'm building up my levy buildings to get a healthy lead over them, but it's slow going. I'm also worried about giving my marshal troops - he's level 12 mil but he's my brother and a pretender to the throne. With my diplomatic super powers he's only ~-30 relations. Can he steal my troops to seize the throne?
Glad to hear you're enjoying yourself ~D
I started with agnatic-whatever gravelkind and I think my first dude died too soon for me to change it. That's the one where the other potential heirs get parts right? Screw that lol.
I still only have one county so my brother doesn't have any land (and so I assume he has no personal levies). I really need him to die in a glorious victory. :P
Yeah exactly. It has its uses at the Kingdom/Empire level, but in my opinion you want to change that to primogeniture ASAP. Especially at the count/duke level, otherwise it causes way more trouble than it's worth :yes:
Good luck in managing the dynasty!
The Crusader kings II official forums are also a good place to look for stuff. for starting tips as well as stories from other players. Very good resource to be had.http://forum.paradoxplaza.com/forum/...sader-Kings-II
As well as this post here at the org.https://forums.totalwar.org/vb/showt...post2053427135
I wrote it to give new players some starter tips, things that aren't blindingly obvious but also things that are incredibly useful.
nah man primogeniture all the way, otherwise agnatic open (turkish succession) and in some cases, such as being in jimena spain or rurokovich russia, go for seniority. gavelkind kinda sux but its the default option :P worst of all is ofcourse elective -_- which i recommend never to use unless you really want to do some serious roleplaying :P well.. it can come in handy if your son is like a total retard but killing him would be easier
is the GoT video game already out? not the rts but the skyrim/AC type game
In my limited experience gavelkind is good to keep on your Duchies/Counties once you're a King - it keeps your Dukes from acquiring too much territory and becoming usurper-capable. Only a real problem if you have Min Crown Authority though.
But I've run into problems with both in my England campaign.
New patch 1.05d is online.
Why all the hate on the byzantines? At least give them a culture specific building. And if you halve the Varangians, do the same to the 8400 strong rumite Ghilman. I have to see what holdings they removed, but I guess they don't care about history.Quote:
Change log for 1.05d:
- Fixed an MP issue where clients would go OOS if the host had clicked around on the bookmarks or time widget at all
- De jure kingdoms can now assimilate into empires
- Fixed a bug with the Crusade CB where the kingdom title was usurped even if the holder was not involved
- Fixed a bug with the 'other_claim' CB where, on success, a title could be broken out of the top realm of the attacker
- Fixed a bug with the 'other_claim' CB where it would make the claimants your vassals when it should not
- Fixed some bugs in the new regency events
- The hostility of attached armies is now determined by the army they are attached to
- A very high opinion of the liege now has a greater effect on reducing the revolt risk
- Can't pick intrigue plots against people with no possible backers (lacking courtiers)
- No longer possible to revoke religious head titles, or plot to do so
- Halved the Varangian Guard in strength
- Removed some more initial Byzantine holdings
- Reduced the initial Crown Authority of the Byzantine Empire a bit
- Increased the initial Crown Authority of the Seljuk Turks and Mauretania
- Fixed a bug with dynasty 715 having a historical CoA when it should not
- Fixed another issue with de jure assimilation
- Vassals in revolt who _attack_ an outside state will no longer make their pre-war liege hostile to the target
- Fixed an issue with too many plots being evaluated for the quick plot button in the Character View
- Fixed another issue with huge plot power values due to the wrong cached military power
- Should no longer be possible to attach armies to navies in port
- AI: Should never try to revoke titles off landless vassals (Varangian Guard, etc)
- AI: Even more likely join a plot with the same goal a character is already plotting for, if the plot power of the asker is higher
- Added trigger 'yearly_income'
- Asking the Pope for an Indulgence now costs a minimum of 25 gold
- Fixed a rare crash when a plot target died while you were inviting a backer in the Diplo View
At least I actually got a funny screenshot from 1.05c:
Spoiler Alert, click show to read:
lame.. i think ill remod the varangians.
Afaik the largest recorded figure for the Varangoi was 5.000...
And actually in most battle reports they are given at about 2.000ish, after all they were "volunteers", already trained professionals...
The Turks usually demanded children in tribute from the steppe's communities or purchased them, going over 12.000 sometimes...
I believe it's due to wanting to replicate history that they are nerfing the byzantines and buffing the Seljuk's. As it stands while the Byz empire is more unstable than the unbreakable powerhouse it was in 1.04, they can keep it together pretty easily. There's almost no chance of the empire imploding unless a huge series of events takes place that makes it so.
Nerfing the varangians is perfectly fine imo, reducing the CA is a bit much though. But CA doesn't even make sense for the Byzantines in the first place anyway... so :shrug:
ur right so i modded the great companies and the catalan company :P
I'm dissapointed with this patch. This day, my plots percentages were going sky high(260000.0% for example) and my basileus was on first and second place in his own grand tournaments.
i had none of those problems, i think it is happening because you are playing with an old save and not a new game. that can cause problems
hmm thats weird. perhaps it did not install correctly? or are more people having problems?
I have a question tangentially related to the game for you guys - when I try to register the game of the Paradox forums (so that I can view the relevant sub-forums) the CD key provided by Steam isn't accepted. I don't get a message saying it's invalid, like I do if I type in random numbers, but entering it just refreshes the screen without doing anything. Does anybody know what I'm doing wrong?
Don't know, but there was a problem redeeming steam code for eu3, maybe it's related?
http://forum.paradoxplaza.com/forum/...ode-from-Steam
And try copy and pasting the code? The last code I had, the characters were not what they appear to be.
I've tried typing it, copy-and-pasting it, removing the 'CKNG' at the start, removing the 'CKNG' and changing the hyphens to make groups of 5 instead of 4 characters...(seriously, I saw that last one suggested).
Just to confirm, is the key I want the one that starts with 'CKNG' that I get by right-clicking on the game in steam and selecting 'view game CD key?'
i had a boxed game so i cant help you :S i can post this question on the board for u if u like
1.05e is released. Rejoice in the coming of a vassal claim fix and AI rulers properly calling in their allies to fight!
Quote:
- When you press the claim of a vassal ruler, he should now remain your vassal
- Kingdoms that are not previously de jure part of an empire can now also be assimilated
- AI: Fixed an issue with calling allies into single wars
- Fixed an issue with the regency events
- Fixed numerous typos in the database and event files
- AI: Fixed a bug with rulers being able to nominate dead children to titles, if not of their own dynasty
Good, now I can keep going with the challenge
bring it on ricki :P
The continuing adventures of the Alexandrov dynasty
Spoiler Alert, click show to read:
Noticed oddities in the crusade system still. If you declare a crusade against an Islamic country which is currently fighting for its independence, while the war is correctly transfered to the mother country if she wins the independence war, if the crusade wins no kingdoms will be awarded to the catholic nations. You'll get a pop-up that says "Crusade Successful!" but no one will get the crown. Though I think they still get all the other bonuses that come with that. It's odd.
Crusades are nothing but annoying for me. I only play as Byzantium and those crusaders are bound to come on my land. My armies will then suffer attrition because the foreigners need to choose this route instead of the sea.
My steam CD key registered without problems, and yes it's the one starting CKNG. That was at release. Perhaps there's a newer batch of CD keys which have not been added to the forum database? Try contacting Paradox on the forum, they seem pretty good about sorting out problems with forum registration.
making sure you are not confusing B and 8's and stuff like that?
Did some digging and found this thread at the Paradox forums: http://forum.paradoxplaza.com/forum/...g-a-Steam-copy
It's a known issue and they've been working on it. If you have problems file a support ticket and paradox will set your game up manually. :yes:
Just wanted to share this silly pic:
https://img694.imageshack.us/img694/...2050300001.jpg
Pope Hilari(o)us cracking jokes and calling for crusades :P
^ Love it.
SO I mucked around with Ulster, even managed to make myself duke, when some snotty Scottish duke fakes a claim on the province of ulster and provides to whip my meager army and its good-for-nothing mercenary supplements in a few days of fighting. I ragequit and tried Galicia. I just about immediately joined one of the wars and rage quit when some Moorish stack rolled over my army. :D
Now I'm in a game as the Duke of Cyprus. It's actually going really well. My Duke is 60 years old, his son is ~40 and is my vassal and stands to inherit Cyprus and Krete. (That was a weird one. With the first duke, I made his son - the current duke - a count so he would inherit everything because I'm stuck with gavelkind. He manages to marry the Duchess of Krete and not matrilinially. notbad.jpg) I forged a claim on Beirut and took it since it was an independent county, and I'm waging a war on Wallachia for Tripoli, which they somehow have (and have no way of defending). Unfortunately the game keeps crashing for me about a month or two after my last save point. Pretty disappointed in that, I guess I'm going to have to troubleshoot it. I'm doing too well to just stop.
One thing that bothers me is it's hard to follow your ruler when he's called up by his liege. The Byz emperors have been in just about constant fighting with the Turks and Caliphate. Once there's a peace, there's a civil war since they usually lose the war with the Muslims. I've remained loyal because the emperor would still kick my butt so that means me and my levies are usually far from home (though this didn't stop me from siring a half dozen children). I wish there was some sort of display, as well as a way to substitute a different commander to head my levies that I have no control over. My Duke was wounded twice (though he recovered both times). He's still marching around defending the Doukas folks from their enemies internal and external though.
Hmm, interesting. So you are doing the inheriting thing? I have done that too with paphlagonia(screens somewhere in this thread). I ended up with most of asia minor. It's a lot more difficult now.
I didn't particularly intend to. I'd like to try to gain land along the coast at the expense of the Muslims, but with the Empire utterly incompetent I'm not that hopeful I'll be able to do much.
get rich hire mercs beat muslims or die trying
the latest album of 50 coin
Alexandrov Adventures Mk III -
Spoiler Alert, click show to read:
Sometimes in your campaigns the Golden Horde and the Ilkhanate won't show up. That's just the nature of the randomness. I was almost afraid I'd gotten one of those games but suddenly...
Spoiler Alert, click show to read:
Next post will detail the mongol war. I wish i had more free time over the weekend or I would have gotten to it then, but soon I'll be clashing with the dreaded enemy of the mid-game. I'm quite looking forward to this. Two hundred years of prep-work - if I survive this war no one will stop me. :book2:
What happened to the byzantines? They usually have around 50000 men at the least.
prolly just had a civil war or sumthing
Very close! Actually the Byzantines have been locked in an eternal struggle with the Seljuk Turks since the start of the game. Each side as been beating the crap out of one another but neither could take advantage even when they won. A combination of internal pressures and constant civil wars kept those two adversaries perfectly balanced.. until the Ilkhanate showed up and trashed the Seljuks in six months. Byzantium is now experiencing a restoration of power and for once since the start of the game is looking like a force to be reckoned with. I feel safe in the knowledge my daughter is married to the Emperor :grin2:
Spoiler Alert, click show to read:
Whew. Now that was fun.
Now that you've beaten them, how do the armies for the Mongols work?
They should have close to no territory, so it should be impossible for them to replenish an army of that size, no?
Their armies are attrition proof, only the levies they raise in conquered territories suffer attrition. Provided they win their initial war they get free events to call in reinforcements from the east that can only happen once per character. Every new Khan as the ability to spawn 4-6 doom stacks of 20k each, each of which are free of attrition as I said. This is why the Khaganates are so powerful despite having very low levy scores on the independant army screen, as their free troops are not counted among that. This is also why you should NEVER EVER assassinate the Khan. If you do, the new khan will be able to call in more reinforcements. 6 doomstacks you might be able to handle, but how about 12?
If the horde converts to another religion, or the year is after 1300, the events are no longer obtainable for the mongols.
I was very lucky the old khan who invaded at the head of the GH didn't die before i beat them. Despite my powerful counter attack and victory at Grodets, a replenished mongol force would have beaten me if the war had carried on for two more years.
also the mongols invade a country but do not replace the ruler so they dont have rebellions often since the defeated will sign a truce and cant rebel for 10 years. and they convert ppl very fast.
Actually the Ilkhanate suffered massive rebellions from the former vassals of the Seljuks after they completely obliterated their entire empire. The problem for me and everyone else is that after 15 years, they'd ruthlessly purged almost every traitor and reconquered every county who had dared to rise up in rebellion. Even as I defeated the GH the Ilkhanate was growing stronger by the day. The Khagans do not mess around...
I wouldn't be surprised if my forces end up fighting another war against the Mongols. I'm closely allied with the Byzantines, and as the Ilkhanate continues to consolidate its power and the Byzantines expand, one has to wonder how long those two will live next to one another in harmony.
Oh dear. I've discovered a huge downside to being on the east end of the map. Even if you happen to beat the Mongols in their initial invasion.. it seems the Khans of the east are quite vengeful.
Spoiler Alert, click show to read:
It looks like I can expect a new batch of doomstacks every ten years or every time a new khan comes to power, at least until 1300. This invasion was much smaller than the last with only 40,000 men. I easily destroyed their push at the battles of Sherkala and Iber-Bolgar.. but that doesn't mean the next will be as easy.This effectively grinds my dynasty power plays and foreign war fighting to a hault. There's no way I can wrestle with the HRE/ERE while dealing with a resurgent mongol threat every 10 years.
For those wondering the Khan character is essentially off the map. You can see him in a certain province but he has no court, and assassinating your way through the line is typically a very bad idea thanks to how the spawning events work. Maybe I can convert him with my court chaplain, i wonder if that still works if the targeted character has no court, we'll have to see. If i can I've heard that stops the free reinforcement events from firing.
Until then it appears that I've had the quite unofficial title of "Guardian of Europe" thrust upon me. So be it. I'll stop each and every invasion dead in it's tracks. Not one step backward!
Interesting interview: http://www.rockpapershotgun.com/2012...A+Steam+RSS%29
Apparently, they might release DLC to make all of the eastern factions more detailed.
Paradox needs to hurry up so they can take more of my money. Also i hope they beta test the patches a bit more this time around, i'd rather not have a repeat of 1.05 where no less than five game breakers were introduced. I'm quite glad they fixed them all within a week or so but come on!
Believe me, beta-testing is more difficult than you think. I have beta-tested a hl2 mod.
1. Different computers get different bugs. I can understand that the PCs on the office are all the same model.
2. You don't really know if something is intentional or not.
3. You gotta be lucky to notice it when it happens.
Anyway, I have had a disaster happen to me. I married off an uncle to a duchess as duke of connacht(1081 start). The uncle went to a scottish duchy. The scottish king thought:"Hey, I can finally send my kilted crazies against some poor guy again!". And this way, I was left with one little county I just conquered the year before :sad3:
ARGH *flips the table* Ahhh well it happened, my poor Russian dynasty is no more. Well I take that back the Alexandrovs are fine, with many branches still living out happy lives throughout Europe. The Rus Kingdom is what is dead. When my heir, Andrei II came to power it kickstarted a massive civil war for control of Hungary. This in turn spiraled into half a dozen independence attempts by vassals all along the western border. One by one my large armies were whittled down, little by little the state was weakened. And then the dreaded enemy returned. The Third Mongol Invasion snapped the power of the centralized Rus state and obliterated all opposition in the east to their rule.
Alexandrov cadet branches are still ruling in Hungary, Sicily, Croatia and Denmark. I've checked most of their successions and they are pretty secure! I wouldn't be surprised if my custom dynasty ends up ruling in half of those kingdoms until game end, however, the main line has lost pretty much everything.
Andrei's daughter, Catherine, still rules in Moskva as a duchess but she is now a Mongol vassal. Andrei himself was killed in the early moments of the third invasion, a plot by the Swedish Queen over god knows what, I'm not sure. Most of the former Rus vassals tried to rebel after the war's end but they were all put down. Funnily enough the only Russian culture characters who are now still ruling independent states free of the Golden Horde are of the Rurikovich dynasty. Talk about salt in the wound!
Oh well. I could keep playing but I think this is a good spot to stop. The rise and fall of the Kingdom of Rus - it was a fun ride :yes:
I have united ireland. When I became king all of those dukes and counts quickly flocked to my cause. Now to get some overseas ambitions...
nah :P i went from king of ireland to king of france to emperor of germany. all using military force!! you have to take m on when they are weak!
Yes, in my new game as Ulster calling England a unified nation is a bit misleading - various parts of it belong to various independent duchies, Norway, Scotland, and Castille (!). I might actually have a chance this time around. In my previous two attempts, England was incredibly powerful and controlled much of Scotland and all of Wales, whilst in the other England and Scotland unified - made it a bit tricky to take them on.
A question for you guys - what do you think is the most cost-effective troop building (out of light infantry/archers, heavy infantry and cavalry)? I tried an experimental all-cavalry approach earlier, and a smaller Welsh army mopped the floor with me before I could hire mercenaries :no:.
In provinces that I am devoting to military building I will usually focus on two areas: Light Cav -> heavy infantry. They are the two heaviest hitters in the dice rolls, barring heavy cav and Horse Archers. The latter you can never get in high numbers unless you hold a Holy Order title, or are the Mongols. Only once I have both of those building lines up to 2 will I focus on my culture specific buildings or my light infantry/archers, depending on where I started.
One of the first things I always do, however, is establish castle towns to level 1 or 2 in each of my personal castles. The way I see it, the higher my income, the more mercs I can hire, and for longer. Only once I get a good economy do I build up my military. Unless I am in Iberia, in which case all bets are off and it's military from day one!
meh kinda depends really, many of those poorer knights would probably be classified light cav. the true shockers would be the retinue's. but ye the number is still quite low. but I found that if you mod the castle to give 25 heavy cav on each upgrade (the numbers stack, so a lvl 4 castle will provide 100 cav multiplied by the levy size modifiers) which gives a fairly accurate number of heavy cav. and give a similar number to the square lists, effectively meaning that france and i think germany can get about 2x as much heavy cav as any other nation. and would not be very unreal to throw an attack bonus in there to resemble their skill.
Hmm, this game might be very good for a ancient time mod like roman times. This game would represent the Seleucid satrapies very well one might think.
Is it actually possible to turn your state into a republic? And if you do, what happens? (says he who still only has the demo)
You might be able to do it if you make a city-county your capital, although I'm not sure why you would want to do it. I don't think republics can be made playable, but that might be a feature for future DLC. You can always simulate playable republics with the elective succession.
Circumstances beyond your control can combine to throw you into "Open Elective" succession laws. Under this succession law EVERY character in your realm, right down to the good for nothing courtiers, get a single vote to cast for the next ruler. This is essentially republic rule in CKII and happens if a Doge comes to power in another realm. For instance if the Doge of Venice were to be voted the next Emperor, you might see the HRE turn into an open republic. It's also possible if a bishop becomes a King or Emperor, as bishoprics usually run under open elective successions as well.
Open Elective differs from the normal Feudal Elective options quite a bit. Under Feudal Electives, all vassals who occupy one social rung beneath the ruler of the realm get a single vote. So if you are a King, all you dukes will get one vote each. If you are a duke, all your counts. Empires work differently in that it's two rungs below, not one. So if you are Emperor, kings and dukes each get one vote. You cannot choose to become Open Elective, however, you can choose to become a Feudal Elective.
Open Elective is not an option for the player beyond some extraordinary circumstances that i mentioned. The game engine right now recognizes your dynasty losing power as a Game Over, as such Open Elective would be a nightmare and republic play would probably be pretty stressful. I wouldn't mind seeing them properly introduce this succession type for players who want to rule republics but it would require a bit of an overhaul to how the game recognizes a failure state. At least for non-feudal powers.