Fleetfoot Moss is a Usable in Torment: Tides of Numenera.
This moss-covered pebble looks almost ordinary, and if it were lying on the ground, it would be difficult to spot. But the moss shifts in unexpected ways, and the pebble vibrates as it does. If held against the skin, the moss latches on and is absorbed, providing powerful resuscitating energies. These pebbles are found by diving into the waters around Sagus Cliffs, perhaps grown by an unknown interaction with the surrounding numenera.