Core Gameplay

Overview of the Core Gameplay Loop

Doom Eternal is built around a relentless, aggressive combat loop known as the "combat dance". The loop is:
1. Engage: dash into a group of demons.
2. Damage: use weapons to deal damage, prioritize weakpoints.
3. Restore Resources: health via glory kills (killing staggered enemies), armor via flame belch (flammable fodder drops armor shards), ammo via chainsaw (instantly kill fodder for ammo pickups).
4. Repeat: keep moving, avoid damage, swap weapons to exploit enemy weaknesses.

Exploration and progression are interwoven: hidden areas contain Praetor Suit Points, Weapon Upgrade Points, Sentinel Batteries (unlock doors for suit/weapon upgrades), and collectibles (Toys, Recordings, Codex entries). The main story is linear with arenas that lock you into combat until you kill all demons.

Player Progression Tiers

Early Game (Missions 1–4)

Main Gameplay Loop

Start with the Combat Shotgun and Heavy Cannon.

Learn basic movement: clamber (grab ledges), double jump (unlocked after mission 1), dash (unlocked via Praetor Suit upgrade, typically mission 2).

Resource management is tight: you have only 4 health bars (base), limited ammo, and 1 chainsaw fuel (recharges slowly). Glory kills are your primary health source, chainsaw for ammo, flame belch for armor (unlocked after Exultia).

Weakpoint system introduced early: shoot the Cacodemon's eye to stagger it for a glory kill; destroy the Arachnotron's turret to disable its long-range attacks.

Combat/Interaction Systems

Glory Kill: Press melee on a staggered enemy (glowing orange) to execute and gain health. Timing and direction can vary.

Chainsaw: Instantly kills low-tier demons (Imps, Soldiers) and drops ammo. Upgrades increase fuel capacity and flesh-eating capability.

Flame Belch: Short-range flamethrower that sets enemies on fire; they drop armor shards when damaged. Crucial for armor sustain.

Weapon Mods (first mod: Sticky Bombs for Combat Shotgun from a mod bench). Switch mods at any time.

Meathook (Super Shotgun): not yet available; you rely on precision bolt or sticky bombs for ranged kills.

Progression

Praetor Suit Points: Found in secret areas. Spend at suit upgrade stations to unlock abilities like "Rising Dragon" (air control), "Thunderous Sky" (increased health from glory kills), "Blood Fueled" (movement speed after glory kill).

Weapon Upgrade Points: Earned by completing combat challenges (e.g., "Kill 20 enemies with sticky bombs") and finding hidden point items. Use them to unlock weapon mods and mastery tokens.

Sentinel Batteries: Rare collectibles (6 in early game) that open locked doors containing Praetor Suit parts or large weapon point drops.

Runes: Not yet accessible (first Slayer Gate in mission 2).

Exploration

Levels are linear but have side paths with secrets. Examples:

Exultia

Cultist Base

Slayer Gates: optional challenge arenas (first appears in Exultia). Completing them unlocks a Rune (e.g., "Seek and Destroy").

Quests/Missions

Main story missions: Hell on Earth, Exultia, Cultist Base, Doom Hunter Base.

Objectives include: destroy Hell portals, defeat the Doom Hunter, reach the Fortress of Doom.

Economy

No currency. All upgrades are earned through exploration and challenges.

Argent Energy does not exist as a resource in the base game (only codex lore).

Character/Build Growth

Limited to one weapon mod per weapon (choose Sticky Bombs vs. Full Auto? Stickies are better).

First Praetor upgrades: prioritize "Dazed and Confused" (stagger enemies longer) and "Haste" (glory kill speed buff).

Sentinel Armor (damage reduction) is helpful early.

Runes: slot up to 3. Early obtainable: "Seek and Destroy" (air mobility), "Ping" (melee punch staggers), "Equipment Fiend" (cooldown reduction).

Endgame

None. The game continues to Mid Game.

Mid Game (Missions 5–9)

Main Gameplay Loop

Acquire the Super Shotgun with Meathook (mission 5: Super Gore Nest). This transforms mobility: hook onto any enemy to pull yourself across arenas.

Add Rocket Launcher (mission 3/4) with Remote Detonation mod for area control, Ballista (mission 6: Arc Complex) for precision hitscan damage.

Master quick-switching combos: Super Shotgun → Ballista → repeat for massive burst damage (known as "SSG-Ballista Quick Swap").

Heavy Demons like Man Cubus, Whiplash, and Pain Elemental appear. Use weakpoints: destroy Man Cubus arm cannons, shoot Pain Elemental head to kill small Cacodemons.

Combat/Interaction Systems

Meathook (Super Shotgun mod) grants immense aerial mobility. Attach to a demon and you can jump off it for a second jump or to avoid attacks.

Flame Belch becomes essential: set a group on fire before using grenades or rockets to shower armor shards.

Chainsaw fuel capacity can be upgraded (second fuel bar).

Grenades: both Frag and Ice Bomb (unlocked via Praetor). Use frag to stagger, ice to freeze groups.

Blood Punch: unlocked via Praetor (charged melee attack that staggers).

Progression

Praetor Suit Upgrades: now you can afford mid-tier: "Blood Fueled" (speed after glory kill), "Thunderous Sky" (extra health), "Chrono Strike" (slow time when glory kill? Actually that's late game). Example: "Seismic Exo" (explosive punch) is later.

Weapon Masteries: each weapon has a mod-specific mastery (e.g., kill 200 enemies with Sticky Bombs to get a 10% damage bonus). Mastery tokens allow skipping challenges.

Runes: acquire all 10 runes from Slayer Gates and discover them in levels. Popular combination: Seek and Destroy + Equipment Fiend + Dazed and Confused.

Sentinel Batteries continue (total 32 in base game). Open doors in the Fortress of Doom for upgrades.

Exploration

Levels like Super Gore Nest, Arc Complex, Mars Core, Sentinel Prime, Taras Nabad have larger arenas and more optional paths.

Slayer Gates (one per mission after Exultia) give runes and later keys for the Unmaykr weapon.

Collectibles: Toys for the Fortress of Doom, Recordings for lore, Codex entries.

Quests/Missions

Super Gore Nest: Destroy the tentacles, kill the Marauder? (actual story)

Arc Complex: Rebuild the Argent Tower. Fight the Khan Maykr’s forces.

Sentinel Prime: Retrieve the Doom Slayer's armor. Memorable fight against the Marauder (required parrying).

Taras Nabad: Retrieve the Empyrean Key. Fight Marauders and heavier demons.

Economy

Still no currency. Points are upgrade materials.

Character/Build Growth

Focus on unlocking Super Shotgun Meathook + Ballista Arbalest for fast combos.

Rocket Launcher mod: Remote Detonation or Lock-On Burst (better for crowd control).

Chaingun (obtained in Mars Core) with Mobile Turret (for sustained DPS) or Shield (defensive).

Praetor Suit priorities: Blood Fueled, Dazed and Confused, Haste (glory kill speed), Equipment Fiend (grenade cooldown).

Runes: unlock Saving Throw (auto-revive on death) from a Slayer Gate in Sentinel Prime.

Endgame Structure

None yet. The game continues.

Late Game (Missions 10–13)

Main Gameplay Loop

Full arsenal: Ballista, Super Shotgun, Rocket Launcher, Chaingun, Plasma Rifle (with Stun Bomb mod), Heavy Cannon (with Precision Bolt), Combat Shotgun (Sticky Bombs), BFG-9000 (found in Nekravol Part I), and Crucible (sentinel sword, limited charges).

Combat is extremely fast. Use quick-switch combos constantly: e.g., SSG → Rocket Lock-On → Ballista → Chaingun Shield for stagger.

Tyrants and Barons of Hell appear regularly. Prioritize killing them with controlled bursts: use Ice Bomb then BFG or Crucible for instant kill on Tyrant.

Archville is a priority target: it spawns extra demons and resurrects dead ones. Kill with Crucible or sustained fire.

Combat/Interaction Systems

Crucible: One-hit kill on any non-boss enemy. Limited charges (3-4). Replenish via pickups. Use on heavy demons (e.g., Tyrant) to save time.

BFG-9000: Fires an energy ball that spawns smaller beams that kill hordes. Rare ammo (found in pools). Best used against dense groups or bosses.

Hologram (Sentinel Armor upgrade): distraction for demons, useful for breathing room.

Sentry Turret (Chaingun mod): stationary but powerful.

Progression

Final Praetor Suit Upgrades: "Chrono Strike" (slow time when performing glory kill), "Seismic Exo" (explosive punch unlocks), "Sling Loop" (speed boost after glory kill). All suit points can be maxed by endgame.

Weapon Masteries: complete all masteries for max damage. Mastery tokens from Sentinel Batteries can skip hard challenges.

Runes: choose your three final runes. Top choices: Saving Throw, Seek and Destroy, Equipment Fiend, or Airborne Aerial Control (air dash).

Sentinel Batteries: all doors opened if you found all 32 (required for 100% completion).

Exploration

Nekravol Part I & II: Hell-based levels with branching paths. Secrets include hidden Crucible charges and BFG ammo.

The Urdak: A linear arena with multiple platforming sections. There is a Slayer Gate.

Final Sin: Earth arena, culminates with the icon of Sin boss fight.

Quests/Missions

Nekravol Part I & II: Destroy the heart of Hell, kill the Khan Maykr's servants.

The Urdak: Ascend to the Maykrs' dimension, fight the Khan Maykr (boss). Strategy: use Super Shotgun for close damage, Ballista for far, parry her energy orbs.

Final Sin: Return to Earth, defeat the Icon of Sin (massive boss with weak spots on arms and chest). Use platforms and all weapons; Crucible can one-shot the head weak point.

Economy

No change. Upgrades fully collected.

Character/Build Growth

Max out Praetor Suit (all upgrades).

All weapons fully upgraded with both mods unlocked and masteries completed (if desired).

Rune setup: for the final boss, consider Saving Throw (revive on death), Seek and Destroy (air mobility), and Equipment Fiend (more grenades).

Endgame Structure

After beating the Icon of Sin, you unlock Battlemode (PvP) and can replay missions on any difficulty. There is no traditional endgame raid or new game plus in the base game.

Endgame (Post-Story)

Main Gameplay Loop

Master Levels: Remixed versions of base game missions (e.g., Super Gore Nest Master Level, Mars Core Master Level). They include new enemy placements, limited resources, and increased difficulty. Available from the Fortress of Doom.

Battlemode: Asymmetric multiplayer (2 demons vs 1 Slayer). The Slayer uses their full arsenal; demons have unique abilities (e.g., Mancubus with shield, Revenant with flying). The goal is to eliminate other team. Not a typical competitive mode but has a ranking system.

Horde Mode (from The Ancient Gods DLC): Wave-based survival with upgrades between waves. Scores are tracked on leaderboards.

Combat/Interaction Systems

Master Levels: Same systems but with increased pressure. You must manage resources perfectly. Example: in Mars Core Master Level, ammo pickups are scarce; rely on chainsaw more often.

Battlemode: Unique interactions: Demons can place traps, heal teammates, revive. Slayer must use environment and quick-switching to survive. There is no glory kill health gain (Slayer has a limited health pool).

Horde Mode: Special currency (Argent) to buy upgrades between waves (e.g., extra dash, weapon damage). Enemies drop currency.

Progression

No additional permanent upgrades beyond what you earned in the main game. Battlemode unlocks cosmetic items (player icons, skins) through milestones.

Achievements/Trophies remain for 100% completion.

Exploration

Revisit missions to find all secrets (toys, recordings, codex). Use Sentinel Armor upgrades to reach previously inaccessible areas (e.g., dash through bars, double jump+glide).

Unmight Maykr (secret weapon): Unlockable through 100% of Slayer Gates (6 keys). Use it for extra power in replays.

Quests/Missions

No new main quests. DLC The Ancient Gods Part I & II add new campaign missions with new enemies, weapons, and abilities (e.g., Sentinel Hammer, Frozen Nade, new mods).

Economy

No economy. Upgrade system is static.

Character/Build Growth

Experiment with different rune and mod combinations in replay. For example, try a Super Shotgun + Rocket Lock-On + Chaingun Shield loadout for high survivability.

In DLC, new abilities like Frozen Nade (freeze enemies) and Sentinel Hammer (ground slam that stuns) add variety.

Endgame Structure

Master Levels: Complete them on Ultra-Violence or Nightmare for bragging rights. They are the primary endgame challenge.

Battlemode: Achieve Slayer rank or reach top demon leaderboard positions.

Horde Mode: Achieve high scores and unlock all difficulty tiers.

100% Completion: Collect every secret, upgrade, and codex entry across main game + DLC.

This tiered breakdown covers all core gameplay aspects of Doom Eternal, from initial learning curves to mastery and post-game challenges.