Grodd goblin

Grodd goblin are sub-race of Goblins that were trapped in the Grodd (demiplane) with Nalavarauthatoryl Due to the demiplanes close proxcimity to the Plane of Shadow, the Grodd goblins developed abilities that allowed them to not be harmed by the touch of shadows. Grodd goblins speak a corrupt form of "Ancient Elven".