Sanctum of the Hierarchs

Summary
The Sanctum of the Hierarchs is the private quarters of the High Prophets on High Charity. You get to fight in this area as the Master Chief in the Campaign level High Charity.

Many events took place here, including the "exchange of hats" when the Brutes replaced the Elites as the Honor guard, after the assasination of the Prophet of Regret. It was here that the Prophet of Truth and the Prophet of Mercy explained to the arbiter his task of landing on the surface of Installation 05 and retrieving the Index from the flood infested Library, which took place in two levels through the Sentinel Wall and the Quarantine Zone.