He goes by many names.

The Dark Lord, The Soul Eater, The God-Slayer

All names referring to the killer of hopes and dreams, the destroyer of kingdoms, the Ram of Tambelon...

Grogar

A name that was once all too familiar to the ponies of the world, this vile sorcerer usurped the throne of the King, and ruled over Tambelon with an iron hoof. Thousands of Tambelon's residents perished to his might, and even more fell to his twisted experiments of necromancy and shadow magic.
It took the combined strength of 100 powerful unicorns to stop him, and even then Tambelon itself was lost to the abyss.
It has been around 1,240 years since Grogar's defeat. And now, he is returning...