The Siren is an uncommon specimen in Killing Floor 2. It is classified as a medium enemy. Sirens appear as anorexic and skeletal females, lacking eyes and features. They also wear a metallic harness over their body, which serves as a crude bulletproof vest. Most distinctively, they have a sonic amplifier device embedded in their throats, allowing them to unleash bone-chilling screeches that damages and visually disorients players within range. You'll hear them scream before you see them, sirens are Zeds that have the ability to unleash horrendous screams that can tear apart the bodies of those nearby. The siren's screams can also destroy explosives, including grenades, making them ineffectual unless they are deployed at just the right time.