Horfeitor

 Giants, they are tall and more powerful than any man. Horfeitor, is a giant among giants. He is something you should fear. When he stands tall, even the tallest mountain can't hide you from it. 

-Nemethor

Horfeitor used to be a giant alchemist who wanted to make his kingdom from gold. During a failed attempt of an alchemical ritual he was turned half stone. He got furious for being deformed, but when he learned that he can become stronger by consuming more earth to his body he started to eat the earth. He ate and ate for years and grew to be the largest giant that had ever existed. He forgot who he truly was and became a monster, a reckless beast of destruction. No one was safe from him.

All the dragons in Mirenia sensed the threat of Horfeitor and they all teamed up to take him down. They failed the first time, but the second time they teamed up with all the humans, giants, elves and everyone in Mirenia and fighting against Horfeitor they were able to make him so tired that for thousands of years since then, Horfeitor has been asleep somewhere deep underground.