Promethean Watcher

Promethean Watchers are advanced Forerunner A.I.s and a new class of enemies in Halo 4. They spawn from the carapace of Promethean Knights, and function as support units. Hovering over the battlefield, Watchers provide support fire with their Boltshots, project Hardlight Shields onto Knights when their shields fail and rarely onto crawler primes, regenerate destroyed Knights, and redirect enemy ordnance such as grenades back towards the enemy using a gravity displacement beam.

A grenade held in stasis by the gravity displacement beam will be released when the Watcher is killed, and will leave its orbit according to the physics engine.

Tactics

 * Watchers are capable of offering support fire for the Knights as well as protection. They can project Hardlight Shields to protect Knights from damage, can catch thrown grenades and throw them back at the player, can repair fallen crawlers, and can regenerate fallen Knights. Keep this in mind when in combat as while Knights are dangerous, Watchers can prolong a fight and should be targeted first.
 * Watchers are support units and consequently will often flee when under fire. THey can contruct forunner anti infantry turrets. They also rarely engage the player directly, and then only in groups, preferring to fly around behind Knights and offer their support abilities.
 * Watchers are small, highly mobile targets, and consequently make difficult targets, even for relatively experienced players.
 * After you kill a Knight, it is possible to use its tactic of reviving it as a trap to kill the watcher due to watcher staying still when reconstituting a Knight.
 * Watchers can be killed in one shot with the Binary Rifle, and so it is advised to find one as soon as possible on Spartan Ops missions where Prometheans are the primary enemy, and to make each shot count.

Trivia

 * They are the only main class of Prometheans that aren't in any subgroups.
 * Watchers can sometimes be seen attached to their Knights without being deployed.
 * Watchers can be assassinated by making the Watchers flee and jump behind the Watcher to assassinate it or when it heals a knight.
 * Watchers have the Reclaimer glyph on their chests.

Appearances

 * Halo 4