Pious Inquisitor

Don't let its luxury fool you, the Pious Inquisitor is one of the fastest ships in the Covenant armada.

The Pious Inquisitor was a Covenant vessel of unspecified classification reputed to be "one of the fastest ships" in the Covenant fleet. The Pious Inquisitor saw action at the First Battle of Earth. The multiplayer level Midship is located in an unspecified section of this vessel. Surprisingly, it's luxurious for a Covenant warship, the vessel may have been the Prophet of Regret's flagship.

Trivia

 * According to bonus features in the Halo 2 Collectors Edition, Begotten Angel was the original name of the vessel featured in Midship.
 * If you look at one of the walls you can possibly see a face, though it is unknown if this is true.