I have this dream trilogy of games in my head based on a tabletop rpg setting I use for a Pathfinder campaign.

The big gimmick is that the only thing these games have in common is the setting. Each one is its own story and genre.

Game 1 would basically be the campaign I'm working on right now but adapted for a computer game. It's a CRPG with turn based combat about a group of adventurers who travel to a city in the desert with a noblewoman who is looking for her friend, a wizard who was researching the ruins of an older civilization before disappearing. On the way to the city the group is attacked by bandits who reanimate to zombies upon being killed, which would be the start of the mystery. Act 1 would be set in the slum surrounding the city walls and the desert around it where the party does work to gain entry into the city, while making a reputation. Along the way they meet the priests of a foreign church, agents of a theocratic empire that wants influence on the city due to its strategic location. The story would end with a mass undead attack and the imperial army rolling in and taking credit for saving the day, gaining a lot of influence within the city's council and seizing control of the area.

Game 2 would be about a war between the empire and the kingdoms who have formed an alliance to hold off the empire's expansion. The events of game 1 gave the empire the strategic advantage it needed to continue its war of "illumination" The player would be a military officer whose superiors were killed, leaving him/her in charge of the forces in a key area in the war. The empire is more advanced in many ways due to being lead by their own gods (nearly extinct space elves from an old interstellar empire) and nothing short of a miracle would stop them in the battle that is approaching. The game would play like a more narrative focused Mount and Blade as you travel with your troops to recruit and train soldiers from the countryside, skirmish with the empire and negotiate with local factions (have fun getting everybody to get along in time for the empire's big assault!) Did I mention that the imperial faith is growing and more and more people are welcoming the invaders with open arms? The player would end up finding a supernatural solution to the problem, contacting some ancient and repressed spirits (the empire being the worst thing that happened to the world's old gods and spirits) who will help the alliance in the battle in exchange for freedom. The player figures that they should take any help they can get, what's the worst that could happen? After some rituals the spirits are free and fulfill their end of the bargain. The empire suffers massive losses and morale is at an all time high among the free kingdoms.

Game 3,or "why consorting with ancient demons is a bad idea". An action adventure game, think something like Castlevania or more forgiving Dark Souls with less numbers. You play as an agent of the imperial inquisition; secret police, exorcist, and monster hunter, 100% hardass servant of the angels. After years of being repressed by the angels the spirits of the old world are fighting back, and hard. And they don't care who gets caught in the crossfire. Civilization is on the verge of total collapse. But there is a sliver of hope, a pregnant woman who's child has the power to stop the madness. Under direct orders from the angels the inquisitor has to fight through the streets of the fallen empire and reach the temple that the woman has taken refuge in to take her to safety. But things are not as they seem, as the story develops the inquisitor realizes that the woman has other ideas.... (spoilers: the woman, under influence of a banished demon who hates both the angels and his brothers, intends on raising her genetically engineered child to save mankind from both the angels and spirits) By the chronological end of the games both the angels and spirits are stopped, and mankind is left to rebuild in peace. Whether the inquisitor lives or not depends on whether he decides to rebel against the angels or suicidally stick to his old allegiances.

The story needs a lot more development that's for sure but I like the little world I came up with.