Side view of the Reaper.

The Reaper is a multiplayer-only weapon introduced in the Hell Followed DLC. It's a gun that unleashes six-round bursts of Hell energy, and has a weapon modification that allows it to charge up a shot for increased damage. It was recovered directly from Hell, and unleashes tortured souls that annihilate opponents. It appears to be designed similar to the Unmaker from Doom 64.

Weapons and Equipment of Doom (2016)
Singleplayer Weapons BFG9000ChaingunChainsawCombat ShotgunFistsGauss CannonHeavy Assault RiflePistolPlasma GunRocket LauncherSuper shotgun
Equipment Delta V Jump-BootsFrag GrenadeHologramSiphon Grenade
Multiplayer Weapons BFG9000Burst RifleChainsawGauss CannonGrenade LauncherHellshotLightning GunMark V PistolReaperStatic CannonVortex Rifle
Equipment Kinetic MineLateral ThrustersPersonal TeleporterShield WallThreat PulseThreat SensorTesla Rocket
Italics = Power Weapons