Dragon Soul Technique (魂竜の術 Konryū no Jutsu) is an ability that Dragons use in order to conceal their souls within the bodies of humans.
The Dragon Soul Technique allows a single Dragon to conceal their soul and Magic Power inside the body of human, which allows them to preserve life force as well as providing antibodies to prevent the process of a Dragon Seed's morphing of a Dragon Slayer into a pure Dragon (if the human container is a Dragon Slayer). It has also been mentioned that this method was used for them to be able to travel 400 years into the present time.
A possible side effect of using this technique is that the Dragon Slayer's memories can be damaged, causing them to forget events or people they've encountered. It has been noted that a Dragon using the ability on a Dragon Slayer allows the Dragon to exit at their own jurisdiction, while if the same technique is used on a regular human that Dragon would need something reminiscent of the power of Dragon Cry to exit.
- Fairy Tail Manga: Chapter 465, Page 11
- Fairy Tail Manga: Chapter 510, Page 11
- Fairy Tail Movie: Dragon Cry