Power drawn for entities, referred to as patrons, allows many to gains strength in exchange for service, worship, or something else. The 3 classifications of patrons are Diving, Titan, and Immortal.
Divine Patrons : Gods & Demi-Gods[ +- ] Gods
Gods Are tied to aspects of their People, not elemental forces. They are patrons to paladins, clerics, and warlocks. Though the gods do not reside in the mortal lands their Avatars and demigod children ensure they are not forgotten.
God Domains (Ideological): Arcana, Agriculture (nature), Death, Deceit (Twilight), Forge, Grave, Knowledge, Medicine (Life), Order, Peace, Protection, Trickery, War. (Note: gods do not grant light or tempest domain)
[ +- ] Demigods
Demigods are offspring of Gods and Mortals, Immortals, or Titans and have existed since the Dawn Age. Most serve their divine parents though some are more independent and/or rebel against them. Demigods rival Titans and can serve as patrons for Warlocks, paladins, rangers, druids and Clerics. As Demigods are half mortal some of them have elemental domains. Due to their mixed heritage they are less at odds with the Incarnations and some were neutral during the Dawn War.
Titans[ +- ] Titans
Titans are beings of power, typically over CR20, who reside in the Mortal Realm and can be patrons to druids, rangers, warlocks, and clerics (usually elemental/nature domains). Most are patrons only to mortal servants who administer their territory and oversee their interests. Sample Titans : Tarasque, Dragons (Ancient/Immortal), Elementals, Ents, Unicorns, Fey Lord, Overmind, etc...
Powerful creatures (CR 20+) that were previously Mortal or Immortal and now somewhere inbetween. Most rule territories and some act as patrons. Domain : Any
Immortal Patrons : Incarnations & Immortals[ +- ] Incarnations
Incarnations reign in the Immortal Realms. None have been known to enter the mortal realms directly but records talk of Avatars sent by them before the Dawn War. While they can be patrons of druids, rangers, warlocks and elemental domain clerics, most are not interested in mortal affairs. Sample Incarnation Domains (Elemental): Nature, Storm, Sun, Moons, Air, Earth, Fire, Water, ...
[ +- ] Immortals
Immortals are creatures native to all the realms other than the Mortal Realm. They mature much slower than mortals and few die of old age. The more long lived mortal races of the People are assumed to be a result of mixing between mortals and immortals during the Dawn Age. Some immortals are almost as old as the Incarnations and are very powerful. Most serve Incarnations though some act independent. They can be patrons to druids, rangers, warlocks, and clerics with elemental domains, and do so for various, often unknown, reasons.