Yirix

Yirix is a female Psion who formerly served the Red Legion. She leads the Psion Conclave, a separatist group that wants to rebuild a Psion civilization where psionic potential can develop freely. After the Witness was destroyed, she became one of the acting leaders of the Shadow Legion and Dread remnants.

The Palindrome

The Palindrome item description from Season of the Chosen describes her early conspiracy. Stationed on a Cabal fleetbase over Nessus after the Red War, she and her conspirators used stolen Vex prediction data to plan assassinations of Commander Zavala. They also built devices, using recovered Traveler Cage technology, that could disable Ghosts and cut Guardians off from the Light. Her attempts on Zavala failed, and Crow intervened both times.

Later

She later ran propaganda broadcasts from a Cabal base on Mars, aimed at Psions and in support of Calus and the Black Fleet.