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From Pathfinder Lost Omens Hellfire Dispatches, which isn't enabled.

Unfetter Sight

FEAT 14
ARCHETYPECONCENTRATE
Activity 1 action
Archetype Hellknight
Prerequisites Signifer's Sight
Frequency once per hour
Requirements You're wearing your signifer's mask.

You release the magic within your mask in an invisible burst, allowing it to temporarily flow into your allies' minds. Each of your allies within a 30-foot emanation gains the benefits of Signifer's Sight for 1 minute, as if they were wearing a signifer's mask.

Pathfinder Lost Omens Hellfire DispatchesORC