Talk:Soul of Light/@comment-71.38.17.12-20111212005738

It appears that your own proximity to a sufficient quantity of pearl/ebonstone is required for the souls to drop, and not the monsters. I've not yet tried killing monsters at max screen distance from me while standing a good distance away from the stones, but souls have dropped from monsters killed at maximum range while I'm standing on the stone. Monsters lured to the stone after being spawned from several screens away and then killed there also dropped souls as well, so spawning location is irrelevant. Be advised though that if you place too much ebon or pearl stone, or place it near blocks it can infect, the monsters from their biomes will begin spawning, even in the underworld, like any other artificial biome.