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		| Aezeal said:I think it's the chance to heal an affliction.. but then there also is something of a scale how hard certain afflictions are too heal as you said. 
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 Think of it as "The chance that any given unit will get a heal check each month."  If a unit makes this heal-skill check, THEN you worry about affliction difficulty.  (Feeblemind is high, but not the highest).
I'm not sure that's the actual mechanic; it may be one modified check rather than two separate ones, and I can only guess how it orders multiple afflictions (I think from easiest to hardest to heal?).  But that's an easy way to understand the "Heal Value": as the chance that any unit will get time with the healer this month.