pf2e.fyi
From Pathfinder #219: Lord of the Trinity Star, which isn't enabled.

Steadfast Grip

FEAT 14

The connection you have with your warshard weapon strengthens it and assists you in maintaining your grip on it in battle. Your DCs against attempts made to Disarm, Steal, or otherwise remove your warshard weapon from your possession are calculated at mythic proficiency. When you designate a warshard weapon, its Hardness increases by an amount equal to half your level, and its Hit Points increase by an amount equal to your level for as long as it is your warshard weapon.

Pathfinder #219: Lord of the Trinity StarORC