Boss: Purple Named - Powerful Boss
Habitat: The Haunted Halls of Eveningstar — Extended and Commentary version only
Description: When you first enter her lair, she will be sleeping. If you get too close, or damage her, or get detected by one of the wandering elementals/mephits in the area, she will wake and attack the party. At that point, she will close the passage to the dimension door you came, and you have two options: Fight and defeat her (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 she can block the path again.
If you successfully steal the egg without awakening her, you get an optional objective reward.