Cruel Overseer (5e Creature)
From D&D Wiki
Medium humanoid (any race), neutral evil
Overseer. The cruel overseer has advantage on opportunity attacks. Additionally, when the cruel overseer uses its reaction to perform an opportunity attack, it may do so again without needing to use a reaction until its next turn.
Multiattack. The cruel overseer makes two attacks with its whip.
In the shadows of the black market, cruelty is a hot commodity. The best of the best need the worst of the worst to protect their ill-earned gains or keep their human stock in check.