You and Anton put all your combined strength into pushing open the heavy iron jagged door. The howls of the damned grew louder and louder as it slowly slid open to reveal a tunnel of shifting flesh.

Welcome to the Maw. Or the Eternal Hells. A place known for holding the damned and forgotten. This section a part of the Dungeon of Change.

For those new, here is the start of the Dungeon of Change series: Darkwood

Generally recommended to start there to understand the lore a bit more and the character Anton Goebel.