Runestone Cliffhanger (Fantasy Forest Story)

"No creature has ever fitted the description "isn't that just a rock?" better than a Runestone Cliffhanger. They spend 18 hours a day hanging from cliffs and boulders, practically indistinguishable from the terrain. But when one sees a friend get close, their runes glow bright and their lively faces return to the world, for a brief but unforgettable moment."