Say her name

Suddenly, a lot of things made sense to Lex. Jeffrey's obsession with cloning, or perhaps it was the obsession of Sanguis Pluvia, was quite notable. Damian had taken up to cloning, but he was at most trying to recreate a perfect clone of Moon, which was harder than it seemed for reasons he could not understand.

Jeffrey, on the other hand, liked to clone anyone he came across, or anyone who attracted his attention. Maybe it was because, deep down, he knew that he himself was just a clone of someone else, and so wanted to create others just like himself. Whatever his personal or mental issue was, it was a fact that this Jeffrey himself was a clone - though that knowledge had been sealed away so that he himself did not know.

It was only upon undoing a part of the seal on himself that this knowledge came out, and it clearly brought Jeffrey a lot of distress.