Dio Valshesis' Twin

"They were too different to be called something that belonged to a human."

- Han Yoojin about Riette Luire's gold dragon eyes

Dio Valshesis' Twin is a skill title granted to blood-related siblings who have killed the twin dragon monsters Dio Valshesis alone.

Origin
The Dio Valshesis' Twin title can be earned by two or more blood related siblings who have worked together (without outside assistance) to kill the twin curse and poison dragons Dio Valshesis, who act as the boss monsters in an S-rank dungeon.

Supplementary skills
As a skill title, Dio Valshesis' Twin grants a variety of supplementary skills.
 * Dragon Transformation (rank unknown): Allows the user to transform into one of the two Dio Valshesis dragons. Each sibling is assigned one of the two dragons for their skill. Noah Luire's ability allows him to transform into a smaller winged white-gold dragon, while Riette Luire's allows her to transform into a significantly larger wingless black and gold dragon.
 * Unnamed S-rank poison skills: Varied in strength and utility. Noah's poison abilities have low lethality but are excellent at paralyzing and cannot be easily nullified, while Riette's poisons are more lethal.
 * Unnamed S-rank curse skills: Varied in strength and utility. Riette Luire's curse skills can only be used under certain conditions and aren't particularly useful in combat; she uses them for creating contracts instead.

Known holders

 * Noah Luire
 * Riette Luire

Synopsis
Riette and Noah Luire entered an illegal dungeon in China which contained the S-rank boss monsters Dio Valshesis. Working alone, the duo killed them, and earned this title as a result. The dungeon disappeared after their exit, having been one that should've appeared 5 years later.