I am just a side character and I like it that way, but Rain keeps dragging me into sealed cave.

Ren woke up with wet stone under his hands and a dungeon heart beating where his chest should have been. He had died while checking a compass he made by hand, then opened his eyes in another world as the thing every hero was sent to kill. That would have been bad enough, but the dungeon was weak, half built, and already drawing hunters toward it like a wound draws flies. Ren could feel every corridor like a nerve. He also kept thinking like a maker, which meant he noticed value first and fear second. A broken charm, a cracked claw, a cheap blade that could save a life, he saw all of it. The problem was that one strange signal on his newest compass pointed to a place that should have been emp...