#DnD Monster: The Nightling
The nightling is a fearsome, but tiny, fey who wandered too far from the light. Created when a quickling wandered from the Feywild into the darkest reaches of the Shadowfell and encountered a nightwalker or something similar, they are undead and fey both, and infused with terrible necrotic energy from the Negative Plane. With the speed of the quickling, and the hideous power of the nightwalker, they sometimes break through into the material plane, a swift killing blur, leaving shadows of death behind them like a plague of darkness. Sometimes the corpses rise as zombies as well, though that often takes longer.