2 phases. Phase 1 ends when Oregorger's mana runs out. Phase 2 ends when Oregorger eats 10 stacks of ore. Heroism at start.
P1: Ranged groups and steps out of puddles (avoid blocking passageways); melee groups away from off-tank and avoids Explosive Shard (knockback + 3 yard range); tanks intercept breath and swap; interrupt rotation on Blackrock Barrage.
P2: Oregorger randomly rolls through passageways looking for ore. Spread out and DPS crates quickly, stay in LoS of healers, safe path behind boss. After crates are open, group up near center and wait for Oregorger to finish. Heal CDs for Earthshaking Collision near end of phase.