Captured

They are spirits of pure energy that have been contorted by the impure science of Aptience and each of these captured are named after a Sword.

They are a combination of using left over Arcana and combining it with the twisted mechanisms of Aptience...

though there are levels of captured.

Twisted: 
forms of captured or better known as abominations and are made of  a higher level of Arcana then the normal captured. They are the deepest darkest depths of society and most were eradicated by Eterience before it fell as they were difficult to control even with Aptiences power.

Melody: 
forms of captured or better known as Vanguard and are a low concentration of Arcana and Aptience so their abilities are limited some of their names are lesser blades like Estoc and Espada.

Harmony:
forms of captured or better know as Sovereign and a high concentration of Arcana and Aptience and are the perfect tool to be controlled by the lords of aptience.