You start the game going to a jungle version of flemeths hut, it is empty for some elf, who is missing a book, then you go off to the Mage Circle to find out what a word means.
So you go off, and run around aimlessly in a non-puzzle, which was an excuse to get some whimpy mage to join you. Then you basically go around that basement room to talk to the talking statue, akin to mage origin story. Then you discover you need lights and a mirrow shards.
For the mirror shards, go do the Dalish elf origin temple to get the shards. For the lights, you go to this thaig.
Now you got both. You go to that Dragon bone bit in Awakening, and fight some dragons then that concept art elf guardian monster, then you enter this tower.
You are now at the Awakenings ending part where 'mother was' you go down the path a little and there is morrigan at the mirror waiting for you.
If you didn't romance her or did the ritual. She much pretty says "you didn't stop me, Flemeth is the bad one, I am running off" then she goes through the mirror, or you can stab her and she falls through the mirror.
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