Elf, Shadow Fey Executioner 2014
CR 8 humanoid
Medium humanoid, lawful evil
Advantage: saves vs. charmed; Immune: magic sleep.
Its weapon attacks are infused with slain foes' essence. Any weapon hit deals + 2d8 necrotic (included below).
Advantage on any Wis (Perception) or Wis (Survival) check it makes to find a creature that shadow fey nobility have tasked it with capturing or killing.
In sunlight disadvantage on attacks and Wis (Perception) checks that use sight.
Bonus Actions
Commands all severed heads attached to creatures to detach and return to the executioner's belt.
In shadows/dim light/darkness disappears into darkness and reappears in unoccupied space it can see within 30'. Smoke tendril appears at origin and destination.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details