Grummus

Strat: Every 10% spawns a bubble someone has to dps down has 3 locations, 2 are on a hill both near each other and other is on island. Has a Tank swap which has 30 secs to do in. Easiest way to do this is hold aggro til almost 40 secs left swap hold for 10 then swap back and repeat. Keep ranged 20-25meters if your not the tank he does a aoe that makes adds spawn based on how many aoe hits and adds are stronger based on number hit. At 40% hp he unroots. You can skip curing gut check if your going for flawless otherwise try to cure it because anyone who dies with it will cause raid wipe.