"Pokemon" boss. Three phases: blue, red, green. You need to interrupt every his "change phase" spell in right timing, with with powercreep you can just stun them at any point of cast and just kill. Tank mving boss around, offtank aggroing red circles to himself by mobing near them (and dps moving away from them). Then stay out of cleave and dodge from cross-shaped telegraph. Then spread and jump.