Hell was the name given to a planet where a species of skeletons lived. They were punished into the firey pits of the planet. However, they found an escape route and all but one fled.
The Beginner landed on Hell and encountered a skeleton named Lord Erdarath. However although he appeared friendly to begin with, he soon attacked the Beginner. In order to defeat him, the Beginner had to destroy Hell. (Skeleton in Hell)
When the Beginner landed in a forest of biomes, one of the biomes was Hell. (Encounters)