Mamono Kurai no Boukensha - Ore Dake Mamono wo Kuratte Tsuyoku Naru

Rudd’s a nobody-- just an E-Rank adventurer with a seemingly useless talent of status immunity. An outcast in a city obsessed with labyrinth crawling, he’s stuck scraping by as a “grubby forager,” navigating guild politics and backstabbing adventurers just to survive. But when a betrayal leaves him for dead without any supplies or help, he does the unthinkable and consumes the flesh of fallen monsters...
(Source: WEBTOONS)