The new version of this is available here: https://www.royalroad.com/fiction/40181/saga-of-the-soul-dungeon

When Caden dies in a car crash he is put in a dungeon core in another world. The problem with that? He still has a conscience, but the original dungeon core is still there in his mind, and it doesn't...

Of course, other people add their own issues:

Two human nations gain access to the dungeon and are not particularly pleased to share.

A sentient plant race claims the dungeon as sacred ground.

And, amidst the chaos, teams of adventurers just want to make a living.