- You may be looking for a Nebari restraint collar.
A control collar was an item that is attached to a Leviathan to establish complete control over both the Leviathan and Pilot. This made it just about impossible for the Pilot to control the Leviathan without Peacekeeper authorization. It also kept the Leviathans from using their starburst ability.
The collar was usually attached along with a Paddac beacon.