The Cradle

The Cradle is a structure located near Echo Mesa on Io. It is a relic of the Traveler during its partial terraforming of the moon, and is a site of holy significance to many Guardians.

A year after the conclusion of the Red War, the Guardian was summoned to Io by visions, and witnessed the Cradle emitting enormous pulses of Light. It is considered likely that the Cradle, and Io itself, remain connected to the Traveler through it's remnant energies.

Trivia

 * Bungie Senior Concept Artist Sung Choi uses the name "Cradle" in an Artstation post featuring concept art of the structure.