Descent of Dragons Card List & Guide
Activate the Crystal to control the Understudies!
do you like golden animation?
This will most likely appear on Instructor Razuvious, who had Understudies in the fight which had to be mind controlled and used as tanks because the boss hit too hard. (I am going to guess that the Massive Runeblade is probably going to be Razuvious' weapon)
Whaaaat? Mind Control Crystal? But it is Healthstone!!