Very little is known about them, however. Their appearance and behavior are identical like normal Vises. The only exception is sharing the exact color of The Cage. The brimstone-like laser while attacking are palish brown-yellow instead of red.
Cage Vis is one of the enemies who were only spawned by bosses but doesn't appear any floors. Two others being the Rag Trite and Brown Dip from the Afterbirth DLC.