Plasma gun/Doom Eternal

Making a return in Doom Eternal, the Plasma Rifle has undergone a redesign. It is now very similar in appearance to the Plasma Gun from Doom 1 and 2 and looks much bulkier when compared to the sleek and futuristic design found in Doom (2016). The primary fire is essentially the same as before, essentially a machine gun with slightly slower-moving projectiles that need to be led on distant targets: one of its mods is an altered version of one from the previous game, while the other is entirely new.

The former is the heat mod: this overall functions in a similar way, with repeated shots building up a powerful blast that can be unleashed as the player desires. However, the blast is now focused in a cone shape ahead of the gun rather than in a circle around the player character, and there are a number of new mechanics. Firstly, the blast is now a three-step charge with the entire coolant shroud changing color to indicate the charge level: it cannot be fired if it does not have at least one bar filled. Secondly, there is a "supercritical" effect associated with the weapon where if a number of shots hit close together they will explode for additional damage: this can cause problems when trying to get Glory Kills, however. Finally, the Mastery "Heated Core" is replaced with a new ability called "Power Surge." With this ability, after firing off a level three (red) charge, the Plasma Rifle will have a brief period of firing high-powered red bolts instead of its normal shots.

The second mod replaces the Stun Bomb with a Ghostbusters-style beam cannon. This locks on to a single enemy (within a fairly short range) and fires a continuous beam of energy at them after a short spin-up time: enemies killed by this fire mode explode on death, with the size of the explosion governed by how large the enemy was.

New for Doom Eternal are additional effects against shields: as well as dealing more damage than it normally would, if a blue shield {from a Carcass or Shotgun Zombie), or the conformal shield of a Doom Hunter) is completely depleted by Plasma Gun fire, it will overload, resulting in a explosion that deals damage to everything around it. The damage is sufficient to instantly kill a Shotgun Zombie. It does not have this effect against magical shields such as those used by Marauders or Arch-viles.

Overview
Pro Tips

Deals bonus damage to Energy Shields.

Maximize damage potential by using at medium to close range.

Upgrades

Mastery

Heat Blast
Firing the Plasma Rifle builds up excess heat that can be released as a powerful blast.

Microwave Beam
Fire a concentrated beam of plasma energy that will lock down an enemy and cause them to explode on death.