The game has a group of quests in which the player will have to help the Daedra deal with their problems, what to expect from them further.
They are greedy and cunning and a person for them is no more a means to achieve the goal, but serving the Daedric princes can be beneficial, they are always supportive of those who serve them. In the world of the Elder Scrolls, there are gods, and their opposites, which reign in their Oblivion Plans.