From Pathfinder Kingmaker, which isn't enabled.

Stag's Helm

ITEM 6

Price 240 gp

Usage worn headwear

Bulk —

This impressive-looking helmet is crafted to resemble the skull of a mighty stag. Although made from bone, the antlers and helm are as strong as iron.

Rather than restrict the senses, a stag's helm enhances them, causing the world to appear in more vibrant colors and significantly enhancing the ambient sounds of the region without making them distracting. While worn, it grants a +1 item bonus to Perception checks.

Activate

Frequency once per day (or once per hour if the wearer worships Erastil)

Effect Choose a single creature within 30 feet. The stag's helm focuses your aim and grants supernatural insight into your next shot. Your target is Off-Guard to the next ranged Strike you make this turn against them.

Effect: Stag's Helm

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