You only need 20 frost attacks to freeze him.
After that you need 15 physical attacks in 15sec to kill him.
The healing got reduced. You only need 16k dps to kill the bosses before the enrage timer kicks in.
The one-shot ability got removed. You can kill the tentacles inside the brain and then go for
the boss again.
He is not immune to fire damage anymore.
Reliquary of Souls:
Essence of Desire casts Spirit Shock every 10sec, the debuff only lasts 4sec.
If all members are using the cannons and no one is outside, the battle doesn't reset anymore.