Gratorkhas

Background
A Gratorkhas is a demon made of special paper that cannot be burned. It takes on the guise of a small doll with pointed limbs and a perfectly round head, a drawn mustache, and dots for eyes. It lures in children with its dance, enthralling them, and leading them to its lair. When its prey has come within its home, the Gratorkhas calls forth the rest of its body, which are identical clones of itself to leap upon its victim and feast upon their still living body.

Gratorkhas love the flesh of children, and will only eat what is still alive. Once their prey has died, they leave the body to rot. They eat slowly, to enjoy the suffering of their victim, and only in places that ensure their prey doesn't die too quickly, being careful not to chew through an artery. Though this happens regardless if they're in a frenzy.

When threatened, Gratorkhas merges all of its lesser selves into one enormous mass, and takes on its true form: A 10 meter lizard man like creature with pointed limbs, and an enormous spiked ball for a tail. It is immune to fire, and all damage done to its body is immediately healed making the Gratorkhas practically invincible. Its only weakness is water of any form, which causes it to dissolve into a puddle of mush. However, unless the creature is fully dissolved, it will return to life once its body has dried.