Were you looking for SDV-class heavy corvette, which was seen in the Halo: Reach level Long Night of Solace?

The DAV-class light corvette[2] or stealth corvette[5] is a class of small starship in the Covenant Navy.

Similar in design, if not implementation, to the UNSC's Prowler-class stealth vessels, the Covenant versions used active camouflage like systems to render them imperceptible to UNSC sensors, and visually invisible.[5] It also possessed electronic countermeasures, able to interfere with the guidance systems of Archer missiles, and was able to gather intelligence or an artif.[5] One of these managed to survive for a time above Sigma Octanus IV, before it was rammed by the UNSC Iroquois under the command of Captain Keyes.[3]