The Doomcannon is a Tier 6 unique weapon which acts somewhat like a shotgun and grenade launcher hybrid.
The Doomcannon's primary ability is automatic shotgun fire. 40 Energy is used per second to fire 7 red plasma projectiles, called "Doom Shot," once every 0.9 seconds (approx. 1.1 shots per second) with a damage per second of 17.5 before armor multipliers. The pieces of shot deal 20 knockback (average knockback power) to enemies they hit.
The Doomcannon's alt ability is a special grenade launcher which consumes 40 energy per use to launch a Doom Grenade. This ability differs from the grenade launcher ability possessed by some generated shotguns, assault fifles or sniper fifles. It deals no damage directly, but it inflicts the Doomed status to all enemies in the explosive area.
Both the primary shot and secondary ability inflict the Doomed status effect on enemies. This special status effect lasts for 7 seconds and causes an explosion centered on the victim if they take a total of 10 damage starting 0.1 seconds after the effect begins. This explosion deals 130 defense-ignoring damage, which can be further enhanced via armor damage bonuses or the Rage buff.
- A good tactic for the Doomcannon is to carry another weapon that deals a large amount of damage in a single attack, such as Tesla's Wrath or the Vintage Scoped Rifle, to trigger the Doomed debuff's explosion. While a follow-up shot from the Doomcannon's primary fire can trigger it, this can typically only be done at close range due to the shots' spread.
- The secondary ability's grenade deals no damage (only inflicts the Doomed status) and might only be good to "pre-debuff" enemies from the safety of some small cover using the fact that grenade's trajectory is affected by gravity. In a direct fight the primary fire should be used whenever possible.
The Doomcannon's sprite is inspired by the BFG from the original DOOM game, as it can be clearly seen on this picture.