Transfer Gate

The Vex Transfer Gate (sometimes called a Warp Gate) is a technology used by the Vex to warp soldier and engineer units from other parts of time and space into the Solar System. They appear on Venus, in certain areas on Mars, in the Vault of Glass, and the Black Garden, teleporting reinforcements to battle Guardians and others. Skolas utilized several of these Gates during House of Wolves' Story mission Queen's Ransom, where he attempted to pull his entire House through time and space.

In the Prison of Elders there is a single inactive gate similar to the one used to enter the Black Garden, which is where the boss of that round stands.

Trivia

 * Although the Vex portals generated by the Warp Gate can be destroyed by players' weapons, the physical structure themselves cannot.