Clan

Clans are associations of individuals led by a King. Each Clan is unique for having its own Aura, which is gained from the Dresden Slate.

Membership
Initiating into a Clan varies with each Clan. The process could be as simple as evaluating a potential member's intentions to written exams to consider their eligibility. Random, or otherwise informal recruitment appears to also be a common process amongst the Clans.

Hierarchy
Each clan is headed by a King, a powerful individual who exerts authority over other clan mates. Each clan member swears loyalty to the King as well as to the other members of the clan, who in turn take care of one another as allies.

Kings
The Kings seem to each be given a specific number. Whether this is a ranking based on their strength or just the order in which they became Kings is yet to be revealed. It is shown that not all the Kings are at war with each other, as Adolf and Daikaku were shown having a normal conversation with no hatred towards each other. Daikaku has stated that the country will be destroyed by this war between the Clans.

Aura
The members of each clan have been seen to use Aura, a powerful force enabling the user to use a variety of offensive and defensive techniques. The color of the aura emitted, as well as its associated element, varies from clan to clan.