Cloning was a concept that was accidentally discovered by a smaller researcher who mistakenly injected the modified nymph blood into a dead body, rather than a Synthetic Nymph's blood. The first clone, a clone of Marx Ivanov, survived only for a few minutes, but was determined to be a clone despite its very different appearance. The clone had metamorphosized DNA and cells that perfectly matched up with Marx's, so they were genetically twins.

The only successful and living clone is Conre, a clone of Connor, who was created right before Kieran's reign of the Black Crusaders. After his creation, research on the cloning process came to a halt because someone as smart as the one who got away could help with more advances on Anthracyllin. The reasons why Connor's clone was the only true successful one are not exactly known, though, it is speculated that it could be because Connor has regenerative abilities because of the synthetic nymph he overcame.

Lee was believed to be a clone of Natz, as an alibi for his sudden appearance in the Crusaders, and why he should've been leader instead of Antoinette. However, he simply looked drastically different than he did a few months earlier, when he became imprisoned because the repercussions of Natz's Coup were all pinned onto him.