Level Up As A Dungeon Raider

Dungeons started appearing on earth out of nowhere. In them contains various beast and monsters which brings nothing but destruction and chaos.
Dave Cole's village was the first to suffer this harsh fate leaving only him and his little sister as the only survivors.
The fate on humanity rest on the hands of monsters who seemed to come from the pit of hell.
Just when all hope was lost, Green streaks of lights decemded upon earth as a blessing giving people supernatural abilities to ward off monsters.
While everyone was getting amazing abilities, Dave who seemed to always have the worst luck got a vision as skill. It to only help him see things more clearer and had no offensive powers when battling monsters.
He is regarded as trash and a disgrace in the village. But what no one expected was that he inherited a level up system.