Meals are served to all prisoners twice a day.
Some guards can be purchased/influenced. This prison colony is being run by a traditionally corrupt mage-ocracy after all.
Weapons of any sort are banned within the confines of the guarded domes. Any prisoner found to be in possession of a weapon will be executed on the spot.
Armour of a metallic is banned within the confines of the guarded domes. Any prisoner found to be in possession of metallic armor will be suppressed and the armor stripped from their body.
Any non-metallic armour while frowned upon may be accepted as long as it is not obviously armor. To include cured leather armour, and leather scale. Any prisoner found to be in possession of banned non-metallic armour shall receive the same punishment as those found with metallic armour.
There is a second portal off the prison colony. Location unknown.
The suppression jewelry, while not removable, may be disabled. Process believed to be known by all guards.
It is generally believed that while the suppression jewelry has a magically component, there is a mechanical (read computer chip with remote control) component as well, or else the non-magical guards wouldn’t be able to use them.
Firearm production is believed to take place outside the walls.