The Keeper

(a.k.a. Kol Turrant)

Every Vassal knows they should never flaunt good fortune, avoiding arrogance and pride. Those who crow too loudly may catch the jealous eye of the Keeper. Even the mightiest hero can be laid low by disease or ill fortune, as the Keeper has a vast arsenal to bring down those that he desires. Once he pulls you down into the darkness, he will snatch your soul before it can reach Dolurrh and add you to his endless hoard, where he can toy with you and torment you until the end of time.
The Keeper is the patron of those who put personal gain above all else. He guides those who use guile to gain gold, regardless of the cost to others. A rogue who invokes Olladra sees themselves as the hero of the story; one who calls on the Keeper has no compunctions about being the villain. Beyond guiding those who place profit before all else, the Keeper is also known for his willingness to make deals—though his bargains are always slanted in his favor. Priests known as Talons make these deals on behalf of the Keeper, though the terms are often abstract and driven purely by faith. An entertainer could bargain with a Talon, exchanging ten years of their life for fame; even if the entertainer subsequently becomes famous, there’s no way to know if this is the result of the bargain, nor to anticipate when the entertainer might suddenly die. This could easily be a part of the backstory of a player character. Did your entertainer make a bargain with the Keeper?
Another possible path for a player character or deadly NPC is that of being a Keeper’s Fang. These people receive visions of things that the Keeper wishes to add to his hoard; these are usually the souls of specific people, but they could also be artifacts or other unique treasures. This is an interesting path for an Assassin rogue, an Oathbreaker paladin, or a Hexblade warlock (from Xanathar’s Guide to Everything)

Religions

• Dark Six