This mod offers a variety of different zombie outbreak scenarios, each with different settings that can be customized at any time.
That's what 28 Days and a Bit 5 – Zombie Mutation is for. Sure, there are Draugr basically everywhere, and a few quests that are concerned with necromancy, but there's nothing like a full-fledged zombie breakout waiting in the wings, just underneath the surface of Skyrim's world. Another popular fiction trope that Skyrim only touches the edges of, however, is the zombie.
