Umbra Prisoners

Prisoners during Umbra's reign were treated very poorly. Those were grifix that committed crimes against the King, but those crimes were often just speaking up against him. Their feet would be chained up, sometimes their feathers were plucked out as a way to mark them as criminals. Sometimes if a grifix said something against the king, their whole family would have to pay for the crime. It depended on different things, such as whether the family stood by their side or how bad the crime was. Often those grifix would even be condemned to die. 

But if two grifix that had an egg were condemned to die, they would only be killed after the egg hatched, so the egg wouldn't die. The baby, or if those grifix had any children, would be kept alive in the dungeons, as a way to "pay off" their parents' crime. They'd be used as test subjects for spells and torture devices. Those born there have limited speech ability, sometimes they don't have a sense of identity or understanding of things such as gender so they are entirely androgynous. Their sphirix often fades away from abuse, and repeated usage of the gem covering lotion that causes the sphirix to disappear. Some remain with no sphirix for the rest of their life. Sometimes their magic solidifies around ghosts that come and go, and there's plenty of those in Umbra's dungeons, that are haunted by all the dead prisoners. Rarely, some ghost will permanently become a grifix's sphirix. 

Most of those prisoners don't get to live for long, but if they're old enough they will be forced to become Umbra Warriors.