Words that create the name SUI GENERIS UMBRA are of Latin origin and mean ‘phantom that is different from everybody and everything' whereas ‘Phantom’ is something that exists but only in your imagination.
There is no so-called 'history' as Sui Generis Umbra has almost no features of a regular band. As eLL claims, it exists somewhere in the space since ever. eLL and Maciej are mere souls who simply try to render the Energy audible. The whole story started thanks to the Lady. “I had explicit vision of the atmosphere that was to be created- I knew exactly what I wanted to hear.