The Illumination Class scout corvette is a small Covenant vessel which uses a piece of Forerunner technology known as a Luminary to locate other Forerunner artifacts, sadly it also detects Humans. During the war, these ships were used to great effect to locate Human colonies for future destruction.
A group of these corvettes is seen scanning a habitable world, escorted by a wing of Seraph Class fighters.
All models - DinoJR
Background - prototype516