The Apocalypse Has Arrived, and I Became a Big Shot by Devouring Core Crystals

The apocalypse arrives, and monsters run rampant! An unlucky designated driver wields a long blade and goes on a killing spree among hordes of monsters with his kidney-deficient buddy! Devouring cores awakens special core patterns. A mutant mother monkey comes for their lives, the Boar King goes berserk... At the brink of death, he awakens the power of core patterns and cleaves his way through the apocalypse! The Boar King's tusks turn out to be perfect material for making a spear? [Critical hits with every swing + Devouring-style power fantasy] Turning the tables in desperate straits, this time he hunts BOSSes to craft his own god-tier gear!