The SCI'ON Trilogy.
Whenever a decision is taken that is of significance to the world. The world divides and two alternate futures are created. In the beginning, there was only one world. That world we name SCI 'ON. All other worlds that sprang from it we name the shadow worlds. Some believe SCI 'ON is the only real world and that all others are mere reflections, hence the name. Others believe that all the alternate worlds are equally real and important, however they may have come into being. Whatever the case, one thing is certain. If SCI 'ON itself - the cradle of creation - were to be destroyed, all other worlds would cease to exist. For SCI 'ON is the mainspring and without it, the shadow worlds would have no point of origin.

The Shadow Worlds,
Legacies,
The Citadel