Chain Skills with Critical and Protection
It is only for critical chance lol. I have r1 with r1 chain mastery and my critical damage on foxes is still way higher than my critical damage on high protection mobs.
Besides, I'm sure the whole for "ignores prot for damage" thing only came to be because someone misunderstood Soluna's phrasing of the skill description in mabidata.
JP Wiki does have a lot of information about charging strike and focus fist that would be nice to be brought over if someone could translate them, though.