Story related and cannot be missed.
Strategy: The four pillars in this room are the key to success here. The biggest ability in the Rock Wraith's arsenal, Arcane Blast can be completely avoided by using these pillars to get out of the wraith's line of sight. You can tell when the boss is ready to use this ability because he begins to suck in all the air in the room. As it is resistant to mostly all attacks, the best time to attack it is when it's core is exposed (he appears to be broken into pieces and his red core is showing). He will also summon Profane, but they are fairly weak and can be easily handled with area of effect abilities.