Doom Siren

A Doom Siren is a close combat Sonic Weapon that is used by Chaos Space Marine Noise Marines, along with vehicles and Daemon Engines that are dedicated to the service of the Chaos God of pleasure and excess, Slaanesh. The Doom Siren is fitted to the marine's Power Armour with a complex arrangement of pipes and tubes around their helmets which can project short-ranged sonic attacks. These attacks are launched against opponents right as the close with the Noise Marine in close combat, and are usually powerful enough to kill or at least temporarily stun their target, allowing the attacker to quickly finish them off as they're caught off guard.

The first known instance of the Doom Siren being used was during the latter stages of the Great Crusade and during the Horus Heresy, where Space Marines of the Emperor's Children Legion began having their armour modified to carry these weapons. The first Doom Sirens were more than likely built by or for marines that wanted to emulate the abilities gifted to several of their commanding officers by the corrupted Apothecary Fabius Bile. Doom Sirens are also used by Chaos Sonic Dreadnoughts, and are built in to the machine's face plate. These infernal devices are also used by Slaanesh Subjugator Daemon Engines for close combat fighting.