Thunderbird is a species bird native to temperate mountainous regions. They are intelligent, powerful, and wrathful. All agree that one should go out of one's way to keep from getting thunderbirds angry.

Thunderbirds can shapeshift into elven form by tilting back their beaks like a mask, and by removing their feathers as if it were a feather-covered blanket. This allows Thunderbirds to easily take part in Blood Bowl without letting on to their opponents their true power until it is too late.