Dark Behemoth is a unique boss from the event The Labyrinth Games IV that can only be fought 3 times a day and rewards you with 5 Sanguine Shades. It is the dark version of Behemoth.
The boss awards you with a Labyrinth Coin and 7,350 points (x3,5 MVP bonus). Players cannot ask for help and must fight this boss on their own.