Upon the Aether Sea (A Dungeon Core LitRPG)

A falling star meets the fading goddess of the hearth and is given one final chance to save himself, and the whole world - become a dungeon core. But the world of Esiliur is dying, and adventurers are forced to delve dungeons no matter the danger by the mages who own their souls. Even death won’t free them - there is no afterlife, and no escape.  Now, Mizar has only days before the same mages arrive to take his magic for themselves.  With a floating magical island at his command, and a magical affinity for plants, he will have to literally grow his defenses if he wants to survive long enough to have any chance of fixing Esiliur. If that is even possible.  Dark Souls meets Stardew Valley in a world where Death has died and dungeons are made from fallen stars.