Cremling-eater

A small winged creature Darkness keeps for hunting Surgebinders — about the size of a cremling, with bound wings and tied legs and a face more like a tiny axehound than a crab. Held to the skin, it drinks Stormlight straight out of someone who would otherwise Surgebind, leaving them suddenly drained and hungry. Pained-looking shimmering eyes; vanishes into a black sack when its work is done. SA:ED:Prologue