With Eye in the fight, start with some maintenance by casting Agony. Afterwards, Shadow Slash. Its a bit tricky, but we want to use Soulward either on near the end of this round, or on the start when Gromli Comes in. Gromli's first cast will be Stoneskin.
At this point, its just a gentle dance timing Soulward and Shadow Slash untill hes down. If the eye doesnt make it, utilize the Blighthawks Lift-off to negate the damage, and finish with Ghostly Bite. The video below is the one shot!