Spoiler Alert: WARNING! This page happens to contain a lot of heavy spoilers that are all originated from the Overlord author, Kugane Maruyama and his collection of written works. Anime-only watchers and Manga-only readers, please take some time off to reflect it over for a bit before choosing to expose yourself on reading the information below recklessly.
Holy Lord is a job class that hailed originally from the New World.
The Holy Lord class seems to be a warrior class used by the adamantite adventurer, Cerabrate who resides in the Dragon Kingdom.