I use the method of taking the largest rock I can pick up, dropping it by the enemy, and quickly breaking it up into tiny chunks. A couple of fireballs later, and the pile can't be put out, won't stop burning, is hard to move, and doesn't impact alignment. (I'm playing as a god god for the first time, and I just got to land four. Leths likes shields and water, so I had to figure out something else.)