Battlemode

Battlemode is the multiplayer mode in Doom Eternal.

Overview
Instead of a traditional deathmatch, battlemode consists in 2-against-1 fights, pitting two player-controlled monsters against one Slayer with a fully upgraded (but not all weapons mastered) arsenal and all health/armor upgrades applied in a best-of-five format.

At the start of a round, both sides jockey for position; until the starting countdown finishes, they cannot attack but are able to move freely. It should be noted that many areas can only be reached by the Slayer, as demons cannot use portals, jump pads, or monkey bars.

The demon side wins a round by killing the Slayer, while the Slayer has to kill both demon players within 20 seconds of one another; if more time passes after the death of one demon player without the second demon player dying, the dead demon will respawn at half health.

In addition to their innate attacks and abilities, the demons can summon various NPC monsters, set up healing areas, generate damaging floors, and prevent NPC monsters from dropping loot in order to deprive the Slayer of resources. Each player can only summon one monster of a given type (2 in the case of the Shield Soldier); trying to summon another will kill the first one and cause it to drop loot that the Slayer can pick up. These abilities have a cooldown time between uses, and the abilities available are tied to "action sets" selected before the match begins.

At the end of each round, both sides are allowed to select upgrades that enhance their inherent abilities and stats. Should the battle extend past three rounds, a power upgrade will be awarded whose effects are much stronger than the standard upgrades.

The demon side needs to use teamwork and combine their unique abilities to gain the upper hand, while for the Slayer it is a test of skill and mobility.

Playable demons
Each demon has two different action sets to choose from that determine the non-unique abilities it can use, and has a play style focused on a specific role.
 * Arch-vile: Able to teleport a short distance, and specializes in area denial and movement restriction. Has the Agile and Summoner action sets.
 * Marauder: Roughly equivalent mobility to the Slayer and good at pressuring the Slayer with close range attacks. Has the Ranged and Pressure action sets.
 * Mancubus: Slow, but strong and hard to kill. Has the Tanker and Support action sets.
 * Pain elemental: Can fly freely, but has difficulty taking cover from attacks. Has the Pressure and Summoner action sets.
 * Revenant: Balanced, with the ability to fly for a short time. Has the Offense and Defense action sets.

Trivia
Battlemode is often considered unbalanced in the favor of demon side, but there is objective evidence of it.