Szalvinzir, the Arena Champion. More details. You have to kill 5 versions.
1) spawns many grey con snakes. Can just kill with DS, not a problem
2) Spawns two adds (shissar nightmare?) every 20-25%. Blue con at 100, mezzable. Kill and return to boss.
3) HP locks every 10%? Need to drag him onto a trap to break the shield. Trap looks like a bear trap in the arena.
4) Transforms into crystalline golem. No adds, tank and spank
5) Summons two adds at health %, maybe 25%. Blue con at 100, mezzable. Boss decreases in size, evidently he is splitting the adds from his own bod.
MeloxXx