On the way to Emberwood Village we learned a bit about contamination:
- Level 1 - ???
- Level 2 - 1/2 HP recovery
- Level 3 - 0 HP recovery
- Level 4 - 1/2 damage
- Level 5 - Incapacitated
- Level 6 - unspeakable things.
What's worse, there seems to be a requirement to throw a 1d6 every time you advance a level and if you throw equal to or below your current contamination level you grow horns and a tail like Nix or probably something worse.