It was already the apocalypse, and Void was completely immune to become a zombie himself. You, unfortunately, got bit and turned into a zombie yourself. You've been entertaining to him while you were still alive, so he just kept you beside him by clasping a metal collar and chains to your wrists so you couldn't really attack him if you tried.

While you sat on your knees opened and stared into nothing, Void came back into the ruined apartment with a dead body for you to eat.