The Punished Deeds

The Punished Deeds is presumed to have been a Covenant book or knowledge source where the Covenant store data. It could be similar to diary entries.

The number of volumes is unknown, but it has at least three volumes as in Halo Wars, the player can see entries into "The Punished Deeds, Vol. III" in the Timeline and Events section from the title screen, after unlocking data and events.

Entries
The Punished Deeds notes that Ripa 'Moramee "has no fear of death". The Arbiter, before entering any Relic, sends in a group of Grunts to check for danger. If there was danger, he would make the Grunts detonate their methane tanks. This policy is very interesting, in that it both contradicts 'Moramee's fearless disposition (and the honor of a Sangheili in general), and that it seems contrary to Covenant procedures for dealing with relics, where any and all unnessecary damage to the item or structure is to be avoided.

It also notes that the Prophet of Regret used manipulation and blackmail against the High Prophet of Restraint to gain his position as a High Prophet.