Atrophy

Your muscles weaken as the strength is drained out of them.   Each point gives -1 to Strength Checks and Saves, and a 20% chance to fall Prone whenever you take a vigorous action.   If you already have a 100% chance to fall Prone, then one of your Atrophy becomes Withering instead.  

Recovery

Reduce your Atrophy by 1 whenever you complete a Night's Rest. Some magic can also remove Atrophy.
Type
Magical