Kobold Press' latest Kickstarter is for D&D 5E and for Pathfinder, and is a 120-page book detailing a dozen or so demonic cults from their Midgard setting (although designed to work with others). You get the PDF for $17, or the print version for $29. For each cult, you also get sample cultists at a range of CRs, new monsters, and cult-specific magic. Thematically, there are Egyptian-themed and Nordic-themed cults as well as various cults created for Kobold Press' Southlands. Click on that charming chap below to jump straight there!