Chthon (Quake)

In the first-person shooter Quake, Chthon is a fierce beast of living lava and the first boss. Chthon was inherently immune to all common weapons the player held, and only the two electrical conductors around his arena could damage and eventually kill him.

It is believed Chthon also has children that exist in one of the two mission packs for the first Quake. They are affected by weapons however, are smaller, and go down much easier than their parent does.