Undine

Encyclopedia Entry:
A water elemental born from concentrated “water elements” joined with the “monsters’ magical energy.”  They’ve become monsters with a woman’s form. They are monsters that have beautiful bodies that are translucent like the water they are made of, and have a pure, kind heart with a gentle disposition. Normally they dwell near sources of water like lakes and springs, and they never aggressively attack humans.

They form a pact with a man through the act of sexual intercourse. The men who form a covenant with an elemental in this way are called “elementalists.”  It is said that they become able to make use of the undine’s power over water. It also is said that the undines stay at the side of the ones who make the covenant like a devoted lover.

To begin with, water elementals look fondly at romantic relations between men and women. On top of that, the monsters’ magical energy inside of them gives them a strong urge to seek intercourse with a man. Obeying their instincts, when they find a man they like, they seek to form a covenant with this man, and try to seduce him. Even after binding the covenant, in order for the covenanter to use the power of water, he must have intercourse with the elemental beforehand. It is necessary to draw out the power of water from each other’s bodies. During this intercourse, the elemental is able to receive the covenanter’s spirit energy, and her own power is enhanced because of it. The power of water usable by the covenanter grows more potent depending on the power of the undine. However, at the same time, in proportion to the amount of spirit energy they take in, the elemental monsters’ magical energy grows more condensed and powerful, eventually contaminating her body.

Before long, their once pure hearts undergo a dramatic transformation, becoming like muddy water: lascivious, and lustful. They will likely end up indulging in the pleasure of wild intercourse with their covenanter in the same way that other monsters do.

They are “water elementals,” and their contamination equals the contamination of the waters of the natural world. Their water jugs are originally full of pure, sacred water with no stagnation, but as they become contaminated by the monsters’ magical energy, so too does the water in the jug become murky. The dirty water flows out into the natural world. As for humans who drink contaminated water, if it is a man, then he transforms into an incubus, and if it is a woman, then she gradually transforms into a succubus. If the water is drunk by a monster, she is empowered, and able to have even wilder sex with men. In this way, not only the water, but the entire land becomes contaminated, gradually changing into a demon realm.

Additionally, they have an extremely difficult time dealing with verbal abuse from their covenanter. If they hear even a little bit of this, they’ll become afraid of being hated by their covenanter. Afterwards, they’ll have wild, frenetic sex with him as though their ordinary gentle personality was a lie. They provide thorough service in order to make the covenanter love them again. They try to imprison a man’s body and heart through sheer pleasure.