I've been thinking about returning with a new idea.
There are three houses/factions present in the land this takes place, all trying to expand and eventually win over the throne, becoming the ruler of all the land.
The Varkan house.
The warlord Taylor Varkan is the alleged ruler, due to his ancestors all being the leaders for as long as this land is in human hands. The house consists of people who believe in the Varkan bloodline, as well as justice and honor as the main values. Only the most honorable and devout protectors of the people are present in this house and strive to reclaim the throne that is rightfully theirs.
So this house consists of paladins, heroes and so on.
The Narah house.
The people in this house believe in the former necromancer Zakmul'narah who was appointed as the god of death after he passed away, due to his immense power over life and death he possessed. Their current leader Rakzal, a distant descendant of Zakmul, is trying to claim the throne and create the kingdom, which would legalize necromancy and human experiments. They believe in a kingdom, where death is not the end, freedom of death magic, as well as its science.
So this house consists of necromancers, users of other black/dark/forbidden magic, outlaws and so on.
The Sylvan house.
This house consists of elves. Their ruler Sylvanus believes in the land before humans conquered this area. The land was in elven hands and it was even shaped by them (It was a giant swamp before) for centuries a long time ago, when humans won a war over them and took the land, which was just transformed into a vast, beautiful and rich with resources land. The warlord which conquered it was an ancestor of Varkan family. So this house basically believes that the land is truthfully theirs and want to reclaim it.
This house consists mostly of elves of all kind.
Now the players which are put into the houses, can make their own ideals and goals, but their main goal needs to be the same or at least similar to the house they chose to follow.
Also, the houses have other problems with each other, not counting their goals. For example, some members of the Varkan house can be racist towards the elves of Sylvan house and so on.
Either way, I await your feedback before going into it further!