I do almost exactly that, but I use a crystal bow instead. No ammo to pick up, and the shots are cheaper than a broad bolt. No godsword or whip either
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First of all, you can pick up broad bolts, but not crystal bow shots, so the broad bolts are cheaper. Second, how do you kill the demon without a godsword or whip? Do you use Darklight as a melee weapon? If so, how many kills do you get per trip? 10?