The Tesla
The Tesla are to be believed a race, which was responsible for the
Great Fusion.
They have supposedly, somehow, exceeded their universe' limit of space curvature, causing their dimension to 'break apart' so to speak, causing the Great Fusion.
This knowledge is the result of research of strange objects and artifacts found all over
terra,
Malus and
Aedes, since the Great Fusion.
Most of these artifacts have no power at all so it seems, but instead information written in what looks to be their language, which has been more or less deciphered by Terrans and Alchemists.