Aura

Aura is a special power used by the members of each of the seven Clans, the Aura of a person depends on which Clan they belong to.

History
Once, long ago, there were Seven Kings who each lived in harmony with one another alongside their fellow clan members.

However, for unknown reasons, a feud between them began and the clans became enemies.

Now, decades later, the feud between them escalates again because of a certain individual, Yashiro Isana.

Types
There are seven clans, each lead by a King and represented by a color, that each possess a unique power granted to them by their Aura.

Trivia

 * A clansman is not obliged to obey the King since transferring from one clan to another is possible. However, it can be theorized that a clansman is bound to a single type of Aura, the Aura of his previous clan vanishing after they've transferred. Exceptions do exist however, as Reisi Munakata was surprised how the Red Aura remained in Saruhiko Fushimi even after he received his Blue Aura.
 * Kuroh Yatogami is also able to manifest Colorless and Silver Auras, along with Yukari Mishakuji (Colorless and Green Auras).
 * Saruhiko Fushimi received his Green Aura after joining the Green Clan, hence, making him the only known individual to possess three auras.