The Order of the Possessed

The Order of the Possessed are crazy guys who decided to replace some parts of their bodies with demonic ones in order to use the magic of demons.

Possessed, by the way, are not really possessed, well, until they overdo it with implants. But when they do, it's a goner. The soul is consumed by the demon whose body parts the careless bastard sewed into his body.

Therefore, the order is trying to be careful with this: no more than three changes and in no case do not sew themselves demonic horns!