From Halopedia, the Halo wiki
Rhadandus was a member of the Keepers of the One Freedom force led by Castor that commandeered Atriox's personal Lich and used it to travel to the Ark through a forerunner portal beneath the surface of Reach. After the Lich crashed and the Keepers were intercepted by Dhas Bhasvod and the Covenant, Rhadandus sat across from the Prelate's Honor Guard as they traveled to The Ark's Cartographer. He picked the armor off of the dead along with Krelis after a brief fight between the two groups that was engineered by the Ferrets. Rhadandus stayed with the group's Phantoms while others made their way to the composer, and was ultimately killed when the Phantoms were attacked by a swarm of Aggressor Sentinels.
Personality and traits
Rhadandus was considered to be a rather pleasant member of his species.
List of appearances