I Came From the Abyss

Dylan Zhou was a genius until a magic beast tore through his heart at thirteen, sealing his talent and leaving him unable to walk. At sixteen, the seal breaks, and he awakens a Black-rank class: Lord of the Abyss. Now Dylan must survive a brutal ranking system, where bullies like Drake Fang crush the weak and the awakening lair tests every student. Can he master the abyss inside him, climb the ranks, and reach the Divine Domain to find his father?

(Source: WEBTOON)