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.

UPDATE: This weapon will also be in Halo 3. Any changes to specifications are as of yet unknown; however, indications are that because of the addition of Spike Grenades, the number of Plasma Grenades that can be carried at once will be reduced from four to three.

UPDATE: In the Halo 3 Public Beta, the number of grenades per type that can be carried simultaneously is in fact two.