For the origins of the Wraiths, I kept that out on purpose. That and about how the other races came to be before the fall of the Soul Gems. Because of this, some civilizations died and others are reborn with techonologies supposedly because of the Soul Gems.
There are plenty of conflicts between the other four races, whether its political, survival, greed, or some form of persecution. But it doesn't have to be just one race against another. Some civilizations hold some sort of coexistance of races to fend off an enemy of multiple races, for example. But in general, Summoners try to keep a neutral stance, their main enemies being the Wraiths, but rarely they could end up in a situation where they'll have to slay even their own kind.
Research on the Soul Gems have been done by those devoted to find out their secrets, but currently there's no working advanced technology to help. My non-Summoner character, Baldor, for example, is a third-generation researcher, using logs from interviews with Soul Gem characters and astrology for possible clues.