Poison the Graverobber, run around the first pillar on the left of the boss gate. Then once they’re separated enough stab Cerah a couple of times. Then poison the Graverober again, run around the pillar, stab Cerah a couple more times then run around the pillar. Rinse and repeat until the Graverobber and Cerah are dead. Then it’s one on one with bootleg Havel. Poison him or fight him straight up. Or both. Took me about 30 poison daggers for the lot of them. And don’t listen to the people who say they can’t be poisoned. They absolutely can.