Warlocks have an unsavory reputation in Dungeons & Dragons Fifth Edition. There's no requirement for them to be immoral or wicked, but their warlock Patrons often are. D&D 5e's Celestial warlock patron is a rare positive and radiant choice. Rather than a devil, fey, or other dubious being, Celestial warlocks make pacts with Upper Planes creatures to wield holy power.
Source:https://www.cbr.com/dnd-5e-celestial-warlock-build-guide/