Dormant until activated, Covenant plasma grenades will "stick" to targets, killing most targets (in Halo 1, anyway) and causing damage to nearby units, including disabling shields. As in the first game, you can carry up to four of these. In the first game, they were carried by both Grunts and Elites.

The plasma grenade has a blast radius of 30 feet, and detonates three seconds after coming to rest.