Step of Silence
From Halopedia, the Halo wiki
The Step of Silence is the Covenant name for a timeframe of unspecified length in the 9th Age of Reclamation, corresponding to somewhere around September-October 2552 in the UNSC Military Calendar.[Note 1]
During the Step of Silence, the Prophet of Truth discussed the loss of the Unyielding Hierophant, as well as the failure of Thel 'Vadamee at Halo with Tartarus in High Charity's Sanctum of the Hierarchs.