Just Got Infected, I Became the Final BOSS

I was infected and you thought I was dead. But when I woke up from the hellish pain, my wounds healed quickly and my strength skyrocketed! I became a being walking on the border between humans and monsters. Others hoard supplies to survive, but I hoard supplies to become stronger! A piece of compressed biscuits repairs wounds, and a box of chocolates stimulates potential. While the other survivors were trembling under the claws of the zombies, I was already leading the beauty, chasing the mutants through the streets. I thought this was just a crazy evolution to survive, until the zombies called me - the same kind. He is the... Final answer to this apocalyptic evolution. I heard whispers from outside the world: "You are the final BOSS"