FusionDex

Litgon2 absorb light from screens and convert it to fuel, preferring computer monitors above all else. Parents warn their children to turn off their monitors at night, lest a Litgon2 overfeed, burn too hot, and destroy their device.

It was created by humans using the power of science. While shining a light and pretending to be a guide, it leeches off the life force of any who follow it.