Carbuncle

A small quick animal, seen mostly as a moving light between the rocks, with a gem set in its skull that throws a clean white beam ahead of it. Miners in the high country will tell you the stone is worth a year's wages and that following it is how men end up at the bottom of shafts nobody knew were there. The carbuncle is not malicious. It simply runs, and it knows the ground, and you do not.

Blinding Flash: 15 ft, save Dex Quick, fail save roll 1d4 radiant and blinded for 1 round, cooldown 2 rounds. It uses this to leave, never to press an advantage.

Lead Away: on any round it is damaged, it flees at speed toward the worst ground available - a shaft, a scree slope, a crevasse - and its light is very hard to stop watching. Any creature that pursues makes a Chance Roll or takes the terrain's consequences. Gemlight: the stone is worth a great deal and goes dark within an hour of the animal's death. It has never once been sold to a buyer who could still see it shine.