Decayer, A.K.A. Experiment 424, is an illegal genetic experiment created by Jumba Jookiba. She is designed to consume calcium rich substances (does so by ingesting them). Her one true place is as the planets protector of children's innocence (a.k.a. The Tooth Fairy).
Experiment 424 was the 424th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to consume calcium rich substances.
424 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
At the unknown point, she was activated, captured, tamed and named Decayer.
Decayer is a light pink fairy-like experiment with three eyes.
She's able to turn itself invisible with a blink of her third eye, the alien DNA used to create experiment 424 used to exist on planet earth and was the origin or the tooth fairy myth. Jumba upgraded experiment 424 so that she could generate coins at will, in order to assist with her one true place.