Val Aru'un
From Destiny 1 Wiki
Val Aru'un is a Cabal Centurion and boss enemy encountered in the Prison of Elders. Although his promotion to his current rank will never be considered official by Cabal High Command, Val Aru'un's fellow prisoners consider him to be Val worth following.
Gameplay
In Challenge of the Elders, Val Aru'un will be protected by a shield that cannot be broken down until the Guardian kills the Psion Flayers running around the area. Doing so will disable the shield and give the player a chance to unleash as many of their attacks as possible on him until his shield recharges.