Me and a handful of disciples were able to cleanse The Rook from a street in Aranna just now. While the process was fun and exciting, we were a little saddened that after our efforts as a team, we received only a handful of experience points for focusing our energies together.
I propose something is added to the game, if not something with more in-game monetary value (more XP?), then perhaps a series of badges indicating our role in the fight, and badges for the number of times we pushed The Rook deep back into the Giants' imaginations.