Unchain the beast!

Fenrir is a monstrously enormous wolf of Norse mythology. 

The gods feared Fenrir’s strength and knowing that he is the son of mischievous Loki, they thought only evil could be expected of him. 
They decided to make Tyr trick Fenrir into being bound with a magical chain made of occult elements. 
When the chain was placed upon him, Fenrir bit off the hand of the god Tyr. 
Fenrir was then gagged with a sword and placed under a rock to wait until Ragnarok begins, then he will break free and unleash chaos.