I used full void and the blisterarm polearm killing them beside the bank with overloads and a yak for banking the corpses. For burning, bring a full inventory of pyre logs in your yak (maple pyre are the cheapest) and a full inventory of vyres in your inventory (28). Drop 2 vyres when you get there and take 2 logs out of your yak. Start burning and grabbing keys, using two pyre burners at once. After you have a full inventory of keys you can loot rewards right away and repeat the first step. I banked with a glory and ran to the fairy ring outside edgeville, and used the fairy ring to the mushroom patch outside Canifis, then ran north-west, opened the trapdoor, the gate, went down the stairs and did it again.