Sentry Bot (Fallout 76)

Sentry bots are robots found in Appalachia.

Characteristics
The Appalachian variant of the sentry bot is identical to the variant of sentry bot used in the Commonwealth. The typical weapons loadout of the sentry bot remains the same as seen in other regions, with a missile launcher and minigun, which is a three barreled variant chambered for the 5.56mm round. However, variants also use alternate weaponry configurations such as dual miniguns.

On top of their formidable ballistic and explosive weaponry, sentry bots have powerful melee attacks and a self-destruct function with equivalent power to a mini nuke. Despite their bulky armor and appearance, they are capable of fast movement and traversing rough terrain. In addition, a sentry bot's entire torso is capable of rotating independently of its legs, functioning akin to a turret, and allowing it to move in one direction while shooting in a different direction, against targets in any direction. Sentry bots also use Mecanum wheels that allow it to strafe right and left without having to turn.

Gameplay attributes
Sentry bots are some of the rarest and the most difficult robots to defeat - fast, agile, heavily armed, and resilient enough to absorb a direct hit from a mini nuke. After losing both main weapons they will initialize their self-destruct sequence and charge at the player character. Even with their ranged weaponry intact, sentry bots often charge into close combat to deliver powerful blows with their arms if one ventures too close, thus deterring attackers from any use of melee weapons.

All variants explode on death with the force of a mini nuke, which can cause significant damage to surrounding opponents. All legendary robotic enemies explode upon death. This explosion does not override the sentry bot's built-in self-destruct, which means a legendary sentry bot will explode twice, occurring after a short delay of a few seconds.

Should a sentry bot engage the player character for too long, they will eventually enter a cooldown period, blasting steam out of their back and exposing their dual fusion cores (alternatively, the fusion cores can always be targeted using Concentrated Fire). Hitting exposed fusion cores causes additional damage. After one explodes, the sentry bot becomes a charred, blackened version of itself, and is safe to loot then for various scrap, ammo, and potential fusion cores.

Sentry bot
The average sentry bot. Armed with the tri-barreled machine guns as standard weapons alongside its close-quarters melee attacks.

Annihilator sentry bot Mk.II
A much stronger version of the regular Annihilator sentry bot, armed with both the arm-mounted machine guns and a pair of mortar launchers on its back. Two serve as security for the core of MODUS in The Whitespring bunker, painted in the black of the Enclave with the 14 stars from the U.S. flag clearly seen on their chests. Other Annihilator sentry bot Mk.II are painted all black.

Whitespring sentry bot
A generally non-hostile sentry bot. It is white in color and only encountered within the Whitespring Resort. It will attack other hostile creatures which come into its range, but will only attack the player character if provoked. The wheels that it rolls on are also different from those on other sentry bots, sporting a more studded ball appearance.

Enclave sentry bot
A sentry bot serving the Enclave in Appalachia. It is painted in the black of the Enclave with the 14 stars from the U.S. flag clearly visible on the chest, just below their head. Encountered in the MODUS mainframe, as well as the SODUS mainframe after Over and Out is completed, taking the place of XB-55.

Hornwright security robot
An aggressive sentry bot, sometimes found at or near Hornwright air purifiers, as well as the Mount Blair trainyard. It is involved in the Battle Bot event quest, and holds security protocols. This sentry bot is unique in that it is armed with flamethrower weapons in place of the standard tri-barreled machine guns and painted red compared to the white of the Whitespring sentry bots or black like those of the Enclave.

Sentry bot strikebreaker
Typically a hostile sentry bot, it is red in color and is most commonly found in the Ash Heap region. Can sometimes appear in Sentry Bot Patrol random encounters. Like the Hornwright security robot found in Battle Bot, it trades the machine guns for flamethrowers, spewing flames over a large range before being forced to stop to enter cooldown mode.

Sentry bot siegebreaker
A sentry bot variant found randomly throughout the region.

Arktos Pharma sentry bot
A sentry bot belonging to Arktos Pharma, located in the Arktos Pharma biome lab, introduced in the Wild Appalachia update.

Named sentry bots

 * Valentine
 * Bessie
 * XB-55

Appearances
Sentry bots appear in Fallout 76.