Physical Vulnerability Down Overwrites Vulnerability Up in Cuff of the Father

[Teiren]

Okay, thank you for verifying that. I'll edit my post to reflect it.

Do you know if it even overwrites Ninja's Vulnerability Up debuff caused by Trick Attack? That would be plain silly, but I wouldn't be very surprised. Even though it's a different icon, it is the same name and effect. Or, reading it again, maybe you meant both the Gobwalker's and the Ninja's.