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Stalkers are robots introduced in Titanfall 2. They were created by the IMC and first encountered by the Frontier Militia on Typhon. Stalkers are similar to BRD-01 Spectres, but feature heavier armor and a more resilient frame that allows them survive damage that would be fatal to Spectres and Grunts; even after losing its legs, a Stalker can remain functional. Stalkers appear to be designed by the IMC as anti-Pilot units that can also pose a threat to Titans in large groups. They use a variety of weapons, but they usually the L-STAR Volt or Mastiff. They can be fatal in groups, but individuals are easy due to the Stalkers low accuracy.
The stalker holds a glowing orange power supply on its back that explodes upon death - this may kill anyone nearby with low enough health.