Hiss Breakers, sometime referred to as Hiss Armored, are a type of Hiss-corrupted personnel and one of the enemy types encountered in FBC: Firebreak.

Similar to the Distorted, these Hiss have undergone a particularly drastic physical alteration, where the upper portions of their FBC uniforms have mutated into organic, shell-like growths impervious to gunfire, and with the upper torso of the former individual erupting from the back.

It is unknown when they first appeared within the Oldest House, but as of 2025 they pose an ongoing threat to Firebreak teams in the field.