"Sacrifice" (knight skill) mentions in its description that it does "chaos" damage but in the log it is described as "true" damage while "Ki Explosion" (monk skill) mentiones "true" damage but is described in the log as "health" damage. Another issue is that first skill can do crit damage while the latter cannot. Why is that? Perhaps both skills should do "true" damage (and their descriptions should mention that) and should also work in crit based builds for the sake of consistency because as far as I know only skills which do percentual amount of damage inflict "health" damage type and are unaffected by crit chance/damage like Giant Slayer, Death Shroud's (armor set) Aura of Death, Masochism, Sacrifice (the part which do 10% damage to your character) and so on.