Demon Seed

A Demon Seed (竜の種 Akuma no Tane) is a plant-like organism that is located inside the body of a Etherious, being the proof of a demonic entity. 
==Description==
Like its counterpart in a Dragon Seed, it is implied by Igneel that it causes the process of becoming a Demon, as well as the proof that someone or something is demonic.Fairy Tail Manga: Chapter 516, Pages 11-12
==References==
Category:Important Terms