...is worth 10 Justice Points
Just did it with my DK and a fellow rogue, cleared the whole place. We noticed the message "You receive currency: Justice Points x10." after the Chess Event and lol'd hard. Suprisingly, Malchezaar gave nothing, as all other bosses in there.
Whats the point? Well, i guess there is none. I just thought it's funny so i wanted to share it