Riddle Me This

During your riders travels, they encounter an odd sort of stranger wandering about the wilds - alone and with no horse, no pack nor supplies, and no shoes. As your rider approaches they turn, and with a guileful grin and a hand outstretched, demand that they stop. Your rider does so - whether they intended it or not.

Answer me this riddle, they say.
Answer me right, you'll be on your way.
Answer me wrong, far you will stray.

I am the shadow cast by night,
from dusk 'till dawn come morning's light.

My swords are sharp, formed not by forge;
The weary traveler fears most their score.

My step is silent as the grave,
Run fast, too late, with me you'll stay.

Who am I?