A large unarmored turret that sits atop buildings and ledges. Often found outside and usually very high up. Contains a small vulnerable capsule attached to its swiveling arm. Traces movement and will fire off a single Heavy round every 5 seconds while having line-of-sight on a Raider.
| Threat | Moderate |
| Role | Ranged Scout |
| Weak points | optical lens, firing mechanism |
| Maps | Dam, Spaceport, Buried City, Blue Gate, Underground, Riven Tides |
| Item | Rarity | Sell value |
|---|---|---|
| Sentinel Firing Core | Rare | 2,000 coins |
| ARC Flex Rubber | Rare | 1,000 coins |
| Advanced ARC Powercell | Rare | 640 coins |
| ARC Alloy | Uncommon | 200 coins |
| Heavy Ammo | Common | 12 coins |
Combined sell value of one of each drop: 3,852 coins.
Use cover to approach. Hit before it gets range. Weak armor = easy elimination up close.