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PFS StandardTremorsensorsItem 4

Legacy Content

Uncommon Adjustment Mechanical 
Source Treasure Vault pg. 109 1.1
Price 100 gp
Usage affixed to armor; Bulk L
These small, metallic devices resemble squashed spheres. They each contain a tiny gyroscope that's incredibly sensitive to vibrations in the earth. While typically worn on one's footwear, the device can be affixed to any part of your armor.

Activate [free-action] Interact; Frequency once per day; Effect You stomp a foot, clap your hands, or create some other source of sound, gaining tremorsense as an imprecise sense with a range of 20 feet for the next 10 minutes.