Gangel the Resurrected

Strategy

 * 1) he is only heroic, tank and spank kill the add when it's up
 * 2) when the chest pops leave it for now and kill adds if there are still up
 * 3) he respawns as epic x2, kill the add when it's up, but don't hit him at all when he casted Necromantic Sphere, you see a slime kind of thing under him and he has black clouds around him .. when they are gone hit him again
 * 4) *be ready for hard hits when he casted Necromantic Sphere, coz he dispells every dot/debuff on him.