How many allies did you have ?The dragon was OK-ish, but the other enemies were destroying my party very quickly, even with an ally - maybe I chose the wrong one. After a while, it looked desperate enough and I just restarted the fight and rushed to the portal, so it was timed for me. I put the caster (here, the Emperor) comfortably in a Globe of Invulnerability, with as many others as possible, and that was it.
The next part was very easy, just by transporting everyone from platforms destroyed by the brain and giving it a few good kicks.
I just gave everyone a potion of speed and summoned:
- Florrick's Cohort - 3
- Hellriders - 2
- Assassin's Guild - 2
- Harpers - 3
- Watch - 3?
- Paladins - 3?
- Yurgir
- Moonmaiden
- A Fire elemental
- An Air elemental
I used Gale's to destroy the Emperor in two turns (Lvl 5 Force spell that does a billion damage) and something else.
I then moved all my companions onto one side of the platform killing the Arcanists.
Sorry- not doing spoilertags as it's tagged as massive spoilers in title.