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From Pathfinder Dark Archive (Remastered), which isn't enabled.

Ghost Blade

FEAT 4
ARCHETYPECONCENTRATE
Activity 1 action
Archetype Mind Smith
Prerequisites Mind Smith Dedication
Frequency once per hour

You alter your weapon's phase so it can more easily strike incorporeal creatures. Your mind weapon gains the effects of a Ghost Touch property rune for 1 minute.

Pathfinder Dark Archive (Remastered)ORC