
This feat has the same description as the parry skill, word for word. No special details, no explanation.
I decided to randomly drag it onto my hotbar way back and discovered it's something you activate!

As seen, it makes everyone around me roll DC 40 reflex save, then announces I parried their attacks if failed.
I currently lack screenshots of use in combat, but I have actually seen it modify attacks to parried.
It also has a colossal AOE range:

Mielliki is still hit.
Now.
Issues:
I've no idea where I got it from.
I've no idea how the DC is calculated.
I've no idea how it affects incoming attacks, only that some get parried.
Does anyone have any idea where did this feat is supposed to do?
My DC is 40 with 30 ranks of parry, 8 levels of duelist, 26 BAB and 14 levels of swashbuckler. Also got 7 dex mod and 8 int mod.