Listless reduces the regen so it reduces the fleshie bonus.
The way it worked before was based on one HP regen effect, the base one, now it works on the base one and the combat only one since they are the ones that truly matter during combat. Your actual reg stat doesn't matter for fleshie bonus.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1  P(!a and !b ... and !z)
Probability
