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The Heavy Cannon is a weapon in Doom Eternal. It is functionally similar to the Heavy Assault Rifle seen previously in DOOM.

As before, the modifications available are either a precision scope for long-range fire, or a micro-missile launcher which launches small missiles with a narrow seeking angle: these explode with a small amount of splash damage a short time after impact. The scope functionality has been changed somewhat since the previous game, however: it is a drastically slower single-shot mode, and uses six ammunition per shot when aimed.

The micro-missiles are essentially the same, save that there are now launchers on both sides of the barrel for a total of 12 shots between loading pauses. There is no longer an upgrade to reduce ammo consumption, as this has been replaced with a new "Primary Charger" upgrade. With this, a kill with standard gunshots from the Heavy Cannon (with the Micro Missile mod equipped) will supercharge the weapon, causing it to glow red for five seconds. In this state missile damage is increased by 30%: with the "Bottomless Missiles" Mastery, this results in the Heavy Cannon being able to deal more damage per second than the Chaingun in Mobile Turret form. Additionally, the micro-missiles can damage the Doom Hunter even when the shield is on.

Codex Entry[]

A common complaint among users of this punch-packing conventional weapon is the weight, as most of the components are forged in Tungstronium, a proprietary alloy developed to withstand enormous stresses imparted by the optional exploding dart ammunition. However, the additional weight makes the Heavy Cannon an ideal sniper rifle, as swaying and tremors are mitigated by the massive bulk. Trigger management is of the highest priority when using this weapon, as self-inflicted gunshot wounds are common thanks to its no-pull reflex trigger system.


Precision Bolt[]

Hold the Weapon Mod button to bring a semi-automatic loader that fires high precision, high powered rounds.

unupgraded Upgraded
Rounds per shot 6
Regular Damage 400
Critical Damage TBA
AoE Radius TBA
Reload speed TBA
Movement speed TBA
Upgrades Description Cost/Mastery
Mobility Precision Bolt movement speed is increased by 15% 3
Fast Loader Precision Bolt reload speed is decreased by 20% 6
Headshot Blast A headshot kill will set off a powerful, secondary blast that deals damage to nearby demons. Challenge:

Micro Missiles[]

Hold the Weapon Mod button to activate a twin rack of missiles that can be fired and seek towards targets.


Basis Upgraded
Missile No. 12
Bullet cost 2
Damage 105 140 (PC)
DPS 1365
Reload Speed TBA
Loading time TBA


Upgrades Description Cost/Mastery
Quick Recharger Micro Missile reload time is decreased by 35% 1
Instant Loader Micro Missile load time is decreased by 75%. 3
Primary Charger Kills with the Heavy Cannon will boost Micro Missile damage by 30% for 5 seconds. 5
Bottomless Missiles Fire Micro Missiles indefinitely without requiring reload. Challenge


The Heavy Cannon shares its ammo pool with the Chaingun. The player can increase their max ammo cap by using Sentinel Crystals and allocating its power to "Ammo" subsystem.

"Ammo" Level Max Ammo
1 60
2 90
3 120
4 150
5 180

Weapon Skins[]

As with most other weapons in Doom Eternal, the Heavy Cannon has several weapon skins available.