Queens

Queens, also called the originals, are the first chiropterans. In
any given generation, there are always two Queens, who are femaletwins born from one of the last Queens, and they are naturally antagonistic with one another Saya and Diva
are the current Queens of their species. They were discovered by Joel
Goldschmidt in the 19th century inside a mysterious creature found in
Iceland known as SAYA. In his experiment, he raised Saya like a
daughter, but kept Diva locked away in a tower with virtually no human
contact, or even a name.

All other chiropterans are born of the blood of Queens, either
through the queen's own efforts or human experimentation. Unlike all
other chiropterans, Queens appear to retain a human appearance at all
times, though they can change their human appearances somewhat. Their
blood can also crystallize and destroy any chiropteran of any level
that was created by their sister queen.

Queens spend only a few years awake at any given time, between decades of hibernation
within a cocoon. Queens have enhanced speed, strength, and endurance
that surpasses those of their chevaliers and other chiropterans. They
may also have some shape-shifting abilities, though during the series
their abilities seem to be limited to modifying to their outward human
appearance. The strength of a queen's traits are dependent on their
feeding regularly on human blood. As such, Diva, who freely feeds on
humans, can also freely use all of her abilities, while Saya, who
avoids feeding, is usually only slightly above human level strength.

When a Queen becomes pregnant with the next generation of Queens,
her blood will lose its dangerous qualities. A queen can only be
impregnated by a chevalier created by her sister queen, ensuring the
purity of the species is maintained.