Frieren: Attribute Hero

Shane wakes up as a fifteen-year-old nobody in a fantasy world where demons still roam and dungeons swallow the careless whole. No combat training. No magical talent. No money. Just one strange ability: he can see the hidden traits of any magical item, rip them out, and forge them into something stronger. Three years of digging through junk in dead-end dungeons, and he's finally scraped together gear worth swinging. But when a routine scavenging trip drops him into a sealed chamber that hasn't been opened in a thousand years, everything changes — starting with the legendary elf mage he pulls out of a Mimic. What he finds buried beneath that dungeon rewrites everything he thought he knew about how he got here. His transmigration wasn't random. Someone wanted him in this world. And powerful forces — human and otherwise — have been watching the thread of fate, waiting for his name to appear. Now traveling alongside the most powerful mage alive, armed with abilities he's only beginning to understand and a luck stat he probably shouldn't have gambled on, Shane heads north. Toward answers. Toward enemies who've been planning for him longer than he's been alive. The world thinks the war is over. It isn't. — Description from novelcodex.org