I reckon the expansion pack will have the option of continuing your previous imperial campaign, or starting a brand new imperial campaign from the first year of the Empire, where factions are set out as they were historically. (like early, middle and late games for MTW)
and the ruling families at the start of the new imperial game are historically accurate.
and civil wars start with new families trying to take over.
and a slightly expanded building and unit tech tree, including things like hospitals or whatever, and the ability to select other imperial religions like Christianity or whatever,
and for giant cities, urban areas would be upgradable though don't know how a siege battle would work with this, with Rome having hundreds of thousands of people in the first century AD (if not more)
and the ability for barbarian factions to rent siege equipment like mercenaries, or keeping siege equipment and their crews when bribing an army to disband.
in fact, there should be a more complex bribing system, where you have in a bribing panel: generals, all units, siege equipment, Diplomats but not other agents and you can select weather to bribe or disband specific units.
and some unique unit upgrades, not just morale, weapons and armour (like javelins, or the ability to hide in grass, or whatever)
and the ability to create villas to hold very large populations outside the cities. each region having a set number available to build.
you should be able to use your diplomats to encourage your own generals to have more virtues and less vices
and maybe more interresting sea battles, even if it is just a non playable, game generated movie sequence to show the events of a naval battle (like a regular battle replay), but with water and ships based on what you go into combat with.
further upgrades for things like roads and so on, and the ability to adopt people as generals (using a list of candidates) without them having to be 'man of the hour' first.
the ability to build large walls across the landscape like the ones built in Germany, Hadrian's wall and in southern Denmark
and a more elaborate mercenary system, where all mercenaries are available, and are not just faction specific mercenaries. instead have mercenaries more expensive for one faction than another, african elephants are more likely to work for Carthage than for Rome... but that doesn't mean they won't if the price is right
and more germanic factions like the Franks and so on.
and imperial objectives for non roman factions, like capture this province, control the trade in this area, build this building, attack this place within so many turns, etc. but smaller rewards than what the Senate provides in the original RTW.
and you should be able to negotiate with rebels a bit more (so long as they aren't immediately hostile to you, give them money to bolster their forces and tell them to attack a specific settlement nearby...
there should be more pirates in the meditteranean, not just in the baltic sea
this unique roman unit would be cool, have your emperor riding a war elephant, like Emperor Claudius did when he invaded Britain
and in night battles, the ability to use more scare tactics...
and the ability to capture warriors and use them as slaves for trade and for gladiatorial games.
just a few ideas...
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