Promethean Watcher/Gameplay

The Promethean Watcher is a variant of the Forerunner Sentinel serving in the Promethean army of the Ur-Didact. They act as primary defensive drones for the Prometheans and their allies in the Halo series.

Combat
Watchers act in a supporting role, assisting Promethean ground units with aerial combat screening and often forcing enemies to engage the Watcher first. Deployable from Promethean Knights, Watchers can heal and augment damaged allies, using Hardlight Shields, and catch and throw back enemy ordnance (e.g. grenades). Their sole weapon is the Boltshot.

Halo 4



 * Watchers can revive dead Knights once from the small glowing orbs of light they leave behind upon death.
 * Watchers can create new Crawlers from raw materials on the ground and summon Focus Turrets.
 * Watchers are equipped with energy shields.

Watchers appear from the campaign mission Forerunner onwards, where they are seen summoning new Crawlers and protecting Knights and other Crawlers. Watchers are a high-priority target, as if they are not dealt with on time, they can heal other nearby Prometheans. Players should think twice about using grenades near Watchers, as they can throw the grenades back. This is especially fatal if the player uses a Plasma Grenade. Watchers have shields, and if they are damaged, they tend to fly away.

Killing Watchers with a fully automatic weapon (e.g. Suppressor) is highly recommended, as precision weapons tend to not fire fast enough to kill the Watcher before it can regenerate its shields. The red reticle range of the Plasma Pistol is sometimes too short to even make the Noob Combo viable on Watchers, which leaves sniper-type weapons (e.g. Binary Rifle) as other good choices for killing Watchers. If a Watcher is killed as it summons Crawlers or Focus Turrets, then the Crawlers or Focus Turrets it tried to summon will not appear.

It is possible to assassinate a Watcher. This is most easily done when a Watcher is either reviving a Knight, summoning Crawlers, or building a Focus Turret. Look at it so you see both sides of its curved carapace but not its front "face", then jump and hold the melee button (default: RB) to assassinate the Watcher.

Halo 5: Guardians


Changes from Halo 4 to Halo 5: Guardians
 * Watchers' abilities are now more limited. They can no longer create Crawlers or Focus Turrets nor revive dead Knights.
 * Their energy shields are now removed.
 * Watchers can now throw back Hydra Launcher missiles and Plasma Caster projectiles.
 * Watcher assassinations have been removed.

Watchers appear from the campaign mission Unconfirmed onwards. Unlike in Halo 4, Watchers are now actually less dangerous, as they are deployed from Knights far less frequently, can no longer summon Crawlers nor build Focus Turrets, are totally unable to revive dead Knights, and are completely deprived of their energy shields. In addition, Watchers can no longer be assassinated.

Warzone and Warzone Firefight introduce the Legendary and Mythic Watchers, both of which are heavily superior over standard Watchers but otherwise have the same armament. Legendary Watchers are colored orange and teal, while Mythic Watchers are colored black and red.