Penance

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Were you looking for Penance, a segment from the Halo 2: Album Two official soundtrack?

Penance Production information Manufacturer Covenant Model CAR-class Technical specifications Engine unit(s) Repulsor Engines Slipspace Drive Yes Usage Affiliation Covenant Navy
	[Source]

Penance was a Covenant CAR-class warship which sent a message to the planet Reach.

[edit] Background

Penance was only mentioned in the promotional Transmissions for Halo: Combat Evolved featured on Bungie's website and may perhaps not even be official canon.