From Destinypedia, the Destiny wiki
- "Ikora heads up a group called 'the Hidden.' They're a 'crack group of intelligence agents.' In other words, spies. I'm just glad she's on our side. "
The Hidden are a group of Guardians who work as deep-infiltration scouts for Ikora Rey, unofficially becoming the Vanguard's spy network. They work in secret, gathering intelligence on the activities of the Darkness and other enemies of the City.