Brutish Overseer (5e Creature)
From D&D Wiki
Medium humanoid (any race), neutral evil
Overseer. The brutish 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 brutish overseer makes two attacks with its bullwhip.
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. This particular overseer is a veteran amongst the fringes of society, and may be placed in charge of larger operations or tasked with violently hunting down any intruders.