Prisoner Exchange

On worlds with a Vex presence, such as Nessus, Io and Mercury, a Minotaur Guard guarding an energy cage with an Ultra will appear. Eliminating the Minotaur Guard will drop nothing, but will make the energy shield around the Ultra disperse, releasing it. Defeating this enemy will drop a loot chest which could contain reputation tokens, engrams or pure loot. In Flashpoints, sometimes the health and loot drops of the Ultra will increase, or more enemies will be added to the cage. For example in the Mercury Fields of Glass prisoner exchange, three Psion Flayers will join the Brawl Gladiator in the cage. This only occurs during a Flashpoint.