Cults are illegal organizations that are usually dedicated to an evil deity. They only abide by the laws of their deity, doing whatever they want. The 3 largest cults are the Cult of the Drow whom worship Lolth the spider queen, the Cult of Nerull whom worship Nerull the god of Death, and the Cult of C'thulu whom worship DeitiesC'thulu, the god of madness.

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Alliance --> Kingdom of MalitisWyvern AccordUnited IslesDwarven KingdomsElven Empire
Independents --> Church of PelorWizard's AcademyThe Kobold BrigadeTroll Tribes
Guilds --> Thieves GuildAssassins GuildAdventurer's Guild
Cults --> Cult of the DrowCult of NerullCult of C'thulu
Mysterious Organizations --> Seers of IoPact of the ShadowlandsThe World-Keepers