Dragon Seed

Dragon Seed (竜の種 Ryū no Tane) is an plant-like organism that forms inside the body a human who uses Dragon Slayer Magic, being the source of what begins the process of Dragonification.

Description
A Dragon Seed is one of the three known side effects of a human learning Dragon Slayer Magic; this specific one is a plant-like organism that simply forms inside one's body and begins their process of Dragonifiction, starting with their bodies producing Dragon-like features such as scales. The only known method to combat a Dragon Seed from completely transforming one is for a host Dragon to perform a Dragon Soul Technique ritual one a host Dragon Slayer to cure their transformation with antibodies that are dispersed from the Dragon residing in their body.