They are- well. For one thing, they're contraband.
For what they are- they're the souls of the deceased encased within metal constructs- like golems in a way.
They are usually used within the highly illegal Deadman Games. Where they are set against each other to fight for the amusement of the audience.
Those Demons that participate will wait for specific individuals to die- and then they go to the place where the souls arrive in the underworld. They look for the soul that they want- and grab it. Because if they waited for it to be out in the larger scope of the underworld- it's easy to lose, as all souls look the same- just dots of light to those who don't know them.
1.5 imperial gallons of tea were consumed during the writing of this postI imagine that he wants to take them back to the Deadman Games. He has probably been given a task by someone who runs one.
Some of them went missing here- and Yuri decided to harbor them and keep them safe until she knows what to do with them.
1.5 imperial gallons of tea were consumed during the writing of this post

Not if my father is one of the people responsible for handling one of the most powerful organisations in my dimension's Solar System.
But I don't mind, really. It'll allow to defend humanity as I see fit.
edited 1st Apr '17 11:51:44 AM by G2BattleConvoy
"We all fail. We all make mistakes. That is what makes us human."