Transcendent suffering 2 description +5.3 damage +4 accuracy
Char has 33% might bonus.. 4 * 1.33 = 5.32 so that's (probably) where the 5.3 is coming from..
Thing is transcendent suffering doesn't apply to base fist damage (if the the char damage range display is to be believed) so might (or any other additive damage modifier for that matter) doesn't have any influence whatsoever on the flat damage added by transcendent suffering AFTER the multiplication between base weapon damage roll and sum of additive modifiers..
Ability description should probably make note of this fact somehow ..
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OR better yet transcendent suffering description is correct and the damage from transcendent suffering should add to base weapon(monk fist) damage roll BEFORE multiplication with sum of additive damage modifiers (Holy COW overpowered endgame monk fists).
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Either way - make it consistent !