Porgol

Porgol was the servant and apprentice of Arcian, a man who built the Necromant House and made who attempted to create a portal to the Pits of Inferno.

One day Porgol betrayed his master and killed him, because he wanted to become the great Necromant King (in which he never succeeded), but he never got the key to reaching the Pits of Inferno from Arcian.