Fires seven beams of continuous biochemical energy which instantly corrode any surface they contact.
The Phage is an Infested shotgun that fires seven beams in a fairly wide spread. Zooming in focuses these beams closer together, allowing the Phage to perform well against groups or individual targets when needed. Contrary to its description, it deals Viral damage.
Holding Zoom narrows from an extremely wide spread to Synapse-like accuracy over about 1.5 seconds. Every time you hold the trigger, it must readjust before it can focus its firepower.
Due to its spread being controllable and damage being continuous, this weapon is quite effective at destroying reactor cores for Sabotage missions.
Phage is the Greek word for "devour". The Phage itself may derive its name from Bacteriophages (viruses that consume bacteria) or Macrophages (cells that consume bacteria and cellular debris).
This is the first shotgun to have a continuous-firing feature, as well as the first Infested shotgun. It is also the first purely elemental shotgun.
The oval bulb near the trigger beats like a heart, which suggests that this weapon is alive.
The Phage could possibly be a reference to Star Trek: Voyager, in which an alien species has an outbreak of a disease called the Phage.
Like with all continuous weapons, you can be cloaked by a Shade or Huras Kubrow as you are firing the weapon, and the cloak will not disengage unless you move out of range of enemies or stop firing the weapon and fire it again, granting high DPS to enemies with little retaliation.