Three phase council fight with phase changes whenever a boss reaches 50%. First we fight Definitely Not a Cult Leader Angel and Old Man.
Old Man will summon adds at skull that make a bad puddle grow until dead, so we make them dead. Old Man will also slap people with a DoT that requires standing in a glowy puddle to enable healers to dispell--dispelling consumes the glowy puddle, so one purge per puddle. Ideally, we do one round of Old Man adds and then during the second add phase we ignore adds and burn down Cult Leader.
In phase 2 it's Winter Queen and Vampire Man who was not as attractive as everyone seems to think. There's very large slow moving animals you have to dodge, a draw-in-and-run-away attack, and healers will have seeds to heal at skulls throughout fight.
Then phase 3 comes, we lust, we deal with all the mechanics, and we kill bosses at the same time.