Tremorsensors

—Adjustment, Mechanical
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 your armor.
•Activate {0}: 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.