[@Crimmy] You asked for what it does... I gave you the in-game use lol. It can still function in roleplay. I would imagine something along the same lines, obviously without the turns. Entering some kind of rage mode which would greatly increase your power, but without any control of it. Which means even though you have this boosted power, you could potentially turn on your peers (hence "berserk"). 

[@demonspade64]I smell trouble... Trying to get Reiji mixed into the wrong crowd right off the bat? lol