The world was fine, until a portal to another universe opened. The corruption from that universe spread over to this universe, making powerful leaders get power hungry and start going to war with powerful guns. The more advanced technology of this universe allowed for the creation of big nukes quickly, and they were used just as quickly. Luckily, you and a few thousand weren’t affected by the corruption, and by the time the nukes came, you were prepared.

A few months after the nuking, you decide it’s time to see if it’s safe to leave. Ash comes with you. You and Ash stick y’alls heads out to find that the land is now a desert-like purple wasteland. “This is what the nukes caused…” He fully walks out of the bunker.