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Heavy stationary sniper turrets usually found on rooftops and elevated positions. Sentinels deliver devastating long-range shots that can chunk most of a player's health in a single hit. Their distinctive yellow canister on the arm is their critical weak point.
Sentinels lock onto targets at extreme range and fire high-damage precision shots after a brief charge-up indicated by a visible laser sight. Between shots they have a lengthy cooldown where they are vulnerable. They are mounted at elevated positions and have excellent sight lines across open areas. The yellow canister on their arm glows when charging a shot.
The Sentinel is a medium-class ARC machine with 500 HP and a danger rating of 6/5. Medium-class ARC machines are the workhorse threat in ARC Raiders. The Sentinel is dangerous in numbers and will pin you down with sustained fire, but a focused burst into the right weak point ends most engagements in seconds.
The Sentinel has 1 weak point: Yellow canister on arm (3x). Hitting the yellow canister on arm is the highest-value target — every shot landing there does 3x damage compared to body shots, which means you can drop the Sentinel with roughly 4 well-placed precision rounds from a mid-tier rifle. Body shots will work, but you'll burn through three to four times the ammo and pull every ARC patrol within a few hundred metres.
You'll find the Sentinel spawning in Dam Battlegrounds, Spaceport, Stella Montis. Common drops include ARC Alloy, Advanced ARC Powercell, Sentinel Firing Core, Heavy Ammo, which makes it a priority target for Raiders running crafting routes for the Workshop tech tree — the rare components from this enemy fast-track several mid-game upgrades. For full map context on where the Sentinel spawns, see our map guides, or compare it against the rest of the ARC bestiary on the enemies index.