Namorrodor

It arrives as a shooting star and then it is on the ground, and the thing that gets up is thin, long-limbed and wrong at the joints, and it crawls rather than walks. It comes into camps at night for children and for anyone sleeping apart from the fire. The old advice has two halves and both matter: sleep close to the fire, and do not sleep alone.

Crawl In: it moves without sound and attacks a sleeping or isolated creature with Advantage. Long Arms: slashing, melee 15 ft, +4 to hit, 2d6+3 (two reaching strikes), taken from outside the firelight without entering it.

Keeps to the Dark: it will not enter firelight and cannot be made to. Any creature within the circle of a fire is unreachable, and this is the entire defence against it. Takes the Isolated: it attacks whoever is furthest from anyone else, always, in preference to easier targets. A camp that sleeps in one group is never troubled. A camp with one person on watch at the treeline loses that person.