Dungeon Mage(Old)

"I'm too old for this," he thought, then promptly did nothing as the cat got run over with a resounding crack because he was, in fact, too old to bother with stuff like this.

Nick was having a moderately bad day in his otherwise decent life when he was isekaied against his will. Making trouble for gods rarely ends well, and Nick is reincarnated as a dungeon core in a world where they are commerically farmed daily. Unwilling to die(or even worse, be stuck playing a tower defense game for eternity), Nick makes himself a human body and sets off to explore this new andmoderately amazingworld!

This is not a traditional dungeon core story.