Global Dungeon: I Become Invincible by Taking Hits

Rift gates descend, forcing the entire world into dungeons. Everyone prays to awaken a powerful talent, but Jiang Cheng only awakens a gray, unknown [Calamity Anchor]. The highest hatred of all living beings is forever locked onto him. His whole class laughs, the whole district hunts him, and monsters across the map chase him. But no one knows that every attack landing on him converts into physical strength. While others grind monsters to level up, he gets beaten to grow stronger. While others avoid bosses, bosses cross the entire map to die at his feet. "Stay ten meters away from me, or you'll be caught in the blast." That is his only warning. And those who don't believe it end up as equipment under the monster tide. Where calamity passes, not a blade of grass remains. — Description from novelcodex.org