Dungeons and Dragons
Deep in the recesses of memory, devas recall what they once were: immortal servitors of the gods of good, spirits who chose to bind themselves to the world in mortal flesh. For millennia, their souls have been reborn to wage an endless war against the forces of darkness. Most devas are fiercely committed to the cause of good, because they fear what they might become if they turn to evil: A deva whose soul becomes corrupted risks being reborn as a rakshasa.
Devas are refined and polite. They follow the highest moral standards, but they are not afraid of violence. They believe that the pursuit of good is an eternal war with the forces of evil, embodied in rakshasas, demons, devils, and the evil gods and their servant angels. Devas wage that war in their hearts as well, constantly vigilant lest evil take root and corrupt their souls, transforming them into the creatures they most despise.
Because they remember, at least dimly, a life in the Astral Sea spent in close company with the gods, most devas are devout worshipers of the gods of good, especially Bahamut but also Moradin and Pelor. Devas seek to achieve a personal connection with the gods rather than approach them through temples and priests. They worship at meals in their homes, setting an empty place for the absent gods, and strive through meditation and prayer to become more like the gods they serve. Deva adventurers are commonly avengers, clerics, and invokers, who savor the experience of divine power flowing through them without any intermediary.
Devas do not have cities or societies of their own, and their numbers are so small that a deva can spend entire lifetimes without ever meeting another of his or her kind. They live among other races and, at least to some extent, adopt their ways. However, all devas remember elements of the life they had before their incarnation in flesh and the beginning of their cycle of rebirth, and they share some common cultural elements of dress, religion, and habits. Devas favor flowing clothes of fine silks, polished metal armor with winglike shoulder ornaments, and headdresses or helmets that suggest crowns or halos. In other ways, they prefer to live simply, without extravagance.