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Transitioners are used in the first and last encounter in the Raid, and have one of the most unique abilities out of every Vex unit introduced. It can change its form, and use dead Vex nearby to repair itself.
Transitioners start out as Minotaurs, but when it gets its limbs knocked off it will take parts from dead Goblins or Harpies. If all of its limbs get knocked off by players it will use parts from dead Vex around it to turn into a Hydra.
Killing a Transitioner requires only one player, though two would be helpful. When a player gets close to a Transitioner, it will trap the player in a field of radiolaria that damages the player. Four white glowing spots will show up on the Transitioner, one on each shoulder, and one on each thigh. Destroying those will allow the player(s) 5 seconds to kill it before its shield regenerates.