These are shapeshifting monstrosities created from the innards of the extradimensional prison. The very beasts that go out and collect crimes against nature and universal laws. This is the form they took when they first made contact with the kymera.

They are both mechanical and organic. Most if not all of their visible being is glistening black, like liquid latex. They can shift parts of their bodies to form weapons, like blades from their arms and razor whips from their tails. They have many arms, most boneless like tentacles for grabbing, sometimes laden with needles filled with toxins their bodies create to suit the things they happen to be apprehending or fighting. Typically these are hidden beneath the long flowing coats they seem to wear, but are also integrated into their bodies via wires and tubes. No part of them is real 'clothing' or real armor that can detach, it is all a part of them. The only things that can detach are the spikes within their tendrils to send launching at their enemies.

They are the only thing that can leave the confines of the Prison and breach the surrounding universes. There is no end of them and they will stop at nothing to collect their targets. This includes psychological, chemical, and even biological warfare.

They are staggeringly intelligent, able to download everything they need to know about a species before launching their attacks upon it. This means they can communicate to anything with a language and make their intentions clear.

They often resort to devastating means if the criminals do not comply.

Though they are typically sent out on capture missions, there are a fair amount of them which patrol the Prison itself. If needed, they keep a tight leash on the Guards and watchers, acting as the highest rank of the hivemind.

If there are ever many of them patrolling about, it's a good indicator something is going wrong within the Prison itself as they are also its last line of defense.