Raising My Trash Ability Into A Broken Sss+ Rank Skill (lightnovel.to)

Vritra is dragged into a divine summoning alongside his mother, where a goddess hands out blessings and titles to everyone else, leaving him a skill so weak it draws mockery. Betrayed and trapped in a labyrinth with no exit, he survives by slaughtering and devouring demons for months, forcing his dormant ability to aw…