You have to completely wear down a cbow before it can be recharged. XBow isn't much stronger than mage short and rune, but it's significantly faster. 3 pray pots, 5 shark, and fill with lobs. Ahrim's provides no runes. And I can't be sure, but I think it autocasts much like any normal element staff. It's a joke, and worthless almost. Regicide and Roving Elves don't have so much of a level requirement. It's the traps that do the killing, and level won't save you there, nor pray. What is it you want to know about the slayer's staff?