It is important to have them mass-aggrod + enough time lasting on SF (dont cast before you stop aggroing them). Then run into a corner (the L shaped giant rock near the boss is great). Usually I kill 18-20 foes before the first SF stops working. Unless Sliver targets the boss, which takes a bit longer. Sometimes, I am unlucky getting like 19 kills, but no recharge, but that rarely happens.
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