Edaphellow

"???" Elements: Plasma, Shadow, Crystal, Spectral

This monster can be bred with two Double Elements.

Whisp + Flutehog

Plasbot + Boodoo

Sox + Shadowmorph

However, it can be bred with a Single Element and a Triple Element.

Stong + Ghazt

Octopiano + Grumpyre

Gooboo + Jeeode

Timbat + Spectgon