Boss: Purple Named - Powerful Boss
Habitat: The Haunted Halls of Eveningstar — Extended and Commentary version only
Description: When you first enter his lair, he will be sleeping. If you get too close, or damage him, or get detected by one of the wandering elementals/mephits in the area, he will wake and attack the party. At that point, he will close the passage to the dimension door you came, and you have two options: Fight and defeat him (You can use the frozen victims as an aid, if you allow the dragon to break the ice pillars); or break the Cave-in and escape with the dragon egg before he can block the path again.
If you successfully steal the egg without awakening him, you get an optional objective reward.