Regalia

A Regalia "is the result of a Spirit Contract with the coin and its wielder," as stated by Nine. A spirit resides in this coin, and the spirit must accept the wielder before a contract can be made. Regalias can lend their owners/contractors unique strengths and abilities; These abilities come from the spirit behind the Regalia. According to Nine, the Regalia is a "recent discovery."

Use
It seems that the Regalia's power can be activated at the free will of the wielder. In order to activate a Regalia, however, a contract must first be made with the Spirit Coin. Regalias have 3 stages and can be upgraded as such. Their appearances and strengths change as they progress through the stages. However, it is unclear how a Regalia can be upgraded.

Ogdoad's Divinity Coins
There are 8 Ogdoad's Divinity Coins in total. They are all in the possession of the Empire.

Other
Regalias that do not fit in specific categories.