I'm going to use this to dump my thoughts and ideas. Feel free to make suggestions or point out conceptual mistakes I'm making!
I'm doing a bit of world building for a game that I'm going to be running. To be specific, the game is going to be evil sky pirate PCs riding around in an airship. It's going to be Prime based, but I'm going to leave myself plenty of opportunities to have the party go to the Planes, both inner and outer.
I'm calling the world Cascade. The upshot of the world is that it's experienced three different elemental-themed cataclysms: The Float, wherein chunks of land spontaneously lifted off the ground and remain afloat, as well as the boundary between the Cascade and Air has been blurred somewhat ("never lose sight of the ground" is a common axiom for the world). The Flood, wherein a series of permanent elemental links between Cascade and Water were established across the world, such that the world is slowly flooding. The third cataclysm is called the Thrust, wherein mountain-sized spikes of earth and stone erupted from the ground, throwing everything into chaos.
I toyed around with creating my own pantheon for the world, but nothing was inspiring me. After thinking about it for a bit, I figured the old classic pantheons never seem to get any love, and knowing that they're supposed to feature prominently on any number of different Prime worlds, I decided that the Greek gods would be Cascade's overarching pantheon. This led to a number of interesting results. Each of the cataclysms roughly corresponded to one of the three main Grecian gods: the Float - Zeus; the Flood - Poseidon; the Thrust - Hades. In my mind, each one also corresponds to the abandonment of the world by one of the Horae: the Float - Eunomia (order); the Flood - Eirene (peace); the Thrust - Dike (justice). With each cataclysm, the world descended further into depravity and vileness.
There are also a number of apocalypse cults that have sprung up. Namely, people who figure that the coming of a fourth and final cataclysm, this time in the form of a cleansing fire. As a result, Dionysus has picked up a strong following in Cascade, along with his attendant revelers.
Death is being handled as such: When somebody dies and then a Raise Dead is cast, an opening to the Underworld is created whereupon the PCs will have to descend and overcome some sort of trial or broker some sort of agreement/deal to recover their fallen comrade. Given that the PCs are all evil, anything they try to accomplish or negotiate will probably turn out horribly. I'm looking forward to this.
The opening adventure will involve the party being hired by a rakshasa to steal a statue. It was a parting gift from the goddess Dike to the people of a nation that kept their faith and through it their nation will be protected (or something along those lines). The thing is usually under heavy lock, key and ward but gets trotted out for state funerals. Once evil hands touch the statue though, whatever protection it afforded the country will be rescinded. I'm planning on having Nike appear on the face of every statue other than one stolen one and make the announcement that they are no longer under her protection.
I haven't decided the exact powers of this statue beyond this nebulous idea of protection, but one power I know it possesses is to make manifest any psychopomp present during the retrieval of a soul. If the psychopomp is defeated, the soul returns to the body and it's like whoever died was just knocked unconscious. I'm going to try working it so that the PCs have a chance to witness this power before the rakshasa gets its hands on the statue. The idea is to force them to decide to risk the wrath of a powerful fiend in exchange for something they'd be able to stave off death with.
Ooh! The party will start off with an airship. You can't be proper sky pirates without an airship! I'm cribbing a page from Eberron and making this thing powered in a similar manner, though instead of a bound elemental, this ship will have a bound fiend (I'm not sure what flavor of fiend yet). In order to keep the fiend cooperative and happy, the party will have to essentially plug innocents in to the ship. The fiend will suck the life energies out of the sacrifice and use that energy to power the ship. It's all rather depraved and evil, as befits the sort of game they're wanting to play. They've already talked about having an arrangement with a corrupt orphanage...
The current party make-up is: rogue Satyr slave-trader, a Succubus and an awakened Velociraptor mage. There are going to be two more players, but they haven't figured out their characters yet. It's all over the place, but I'm ok with it. This world is pretty messed up. We're doing a character creation session this Sunday, which should be fun. I'm planning on writing up a series of questions that I want them to answer for their characters. Stuff like:
Who do you owe debts to?
Who owes debts to you?
What lines won't you cross?
What do you covet?
What do you treasure over all else?
If the world were to end tomorrow, how would you spend your last day?
If anybody has any other good questions to suggest, I'm all ears.
Umm...what else? I'm planning on having Zeus whoring around, as per tradition. At some point, I'm planning on having the PCs pursued by some love interest of his. Basically a flying woman wreathed in lighting who tries to blast them out of the sky. She may go down quickly, but she'll just be brought back again and again.
I'll need to do some deeper research into the pantheon, just to see what occurs to me as being interesting to include in the game. That can wait until the game is actually under way though.
So this is the working pantheon I've developed, using Pathfinder's domains:
Gods who are still active in the world:
Ares (CN god of savage warfare and strife): Chaos, Destruction, Strength, War
Athena (LG goddess of wisdom, crafts and tactical warfare): Knowledge, Law, Protection, War
Dionysus (CN god of wine and madness): Charm, Chaos, Madness, Plant
Eris (CN goddess of discord and strife): Madness, Trickery, Luck, Chaos
The Furies (LE agents of justice): Air, Evil, Law
Hades (NE god of wealth and the dead): Darkness, Death, Earth, Repose
Hecate (NE goddess of magic, moon and ghosts): Darkness, Death, Magic, Trickery
Hephaestus (LN god of fire and smithing): Artifice, Fire, Strength
Hera (TN goddess of marriage and vengeance): Community, Law, Nobility, Protection
Heracles (LN god of strength): Strength, Glory
Hermes (CG god of travel, commerce, and thievery): Liberation, Luck, Travel, Trickery
Pan (CN god of the wilds and nature): Chaos, Charm, Animal
Hestia (NG goddess of hearth, home, and family): Community, Fire, Protection
Poseidon (CG god of the sea): Destruction, Earth, Water, Weather
Zeus (LN god of the sky): Air, Law, Nobility, Strength, Weather
Persephone (NG goddess of the earth and plants): Earth, Plants, Death
Gods whose time upon the world is fading:
Aphrodite (NG goddess of love, beauty, and fertility): Charm, Healing, Trickery
Apollo (LG god of prophecy, healing, and the sun): Glory, Healing, Knowledge, Sun
Artemis (CG goddess of wildlife, the wilderness and childbirth): Animal, Healing, Plant
Demeter (TN goddess of agriculture): Community, Earth, Plant
Nike (LG goddess of victory): Glory, Nobility, Protection, War
Tyche (CN goddess of good fortune): Community, Luck, Destruction
Asclepius (LG god of healing and medicine): Healing, Protection, Repose
Hypnos (TN god of sleep): Darkness, Charm
Gods that have abandoned the world:
The Horae:
“Behold what manner of race the fathers of the Golden Age left behind them! Far meaner than themselves! but you will breed a viler progeny! Verily wars and cruel bloodshed shall be unto men and grievous woe shall be laid upon them.”
—Aratus, Phaenomena 123
Dike (LG goddess of moral justice): Earth, Law, Good
Eunomia (LG goddess of order and law): Good, Law, Nobility
Eirene (NG goddess of peace): Good, Protection, Healing
I lifted a fair portion of it from the Pathfinder boards, but I've expanded it a fair amount. I'm planning on maybe eventually putting together a list of the titans and their associated domains and/or developing a few custom domains for some of the more specific gods/goddesses. Like I think I want to develop the Hypnos/Morpheus/Aergia trio and develop a good cult following for them.