Hi Nick,

I'm doing something like that for my AW hack called 'Haven'. It's set in a post-post-post-apocalyptic world where the world is tainted with necros and swarming with undead creatures. Everything is tainted and there's a lot of radiation-like analogies in how the rules work.

Players have a 'Corruption' Countdown clock and a stat called necros (you could replace with radiation). I then just made two custom moves:


Corruption: whenever a player enters a breach, is touched by the Dead, uses hideous strength or open your brain, mark a segment on his corruption countdown.

Corrupted: when your corruption countdown hits 12:00, roll+necros. On 10+, you gain two from the list below: one chosen by you and one by the MC. On 7-9, choose one. On a miss, nothing happens. You’re lucky this time.

• You’re changing. Replace one part of your look with something deathly. If it’s all deathly, you’re Dead.
  You’re stranger. Gain +1weird (max +3)
  Your mind’s slipping. You must act under fire whenever ___.
  You’re weaker. Take a debility.
  You understand now. Gain +1Hx with someone who’s mystic
  It won’t come off! Gain +1necros (max +3)