The Siren is a new Xenomorph variant in Aliens: Fireteam Elite 2. This normal-looking alien is a minor threat on its own, but it can make an onslaught even bigger and longer by alerting the hive.
Sirens usually stay back, acting as living alarms that must be silenced before they summon additional enemies. They're weak and vulnerable to all weapons, so a trained squad needs to keep an eye out for them and act fast.
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