If a worm that walks is slain with Sunsword (and is thus disintegrated), it doesn’t dissolve into maggots like it ordinarily would.

Add another dig-up-a-gravestone effect that creates a bunch of maggots around the player with the message “The grave is full of maggots!” If maggots are genocided or extinct, either produce a YAFM or defer to one of the other effects.