The Atomic Goliath
Heavy GunnerA fully armored Institute enforcer built around a high Intelligence base that powers top-tier energy weapon mods and near-unlimited Fusion Core life. Nuclear Physicist triples core duration by endgame, Science! unlocks max-tier weapon modifications, and Heavy Gunner stacks to double all heavy weapon damage across five ranks. Chemist extends combat chem windows, Demolition Expert quadruples explosive output through VATS, and the X-01 Mk.V soaks return fire at the highest damage resistance in the game.
Damage
Heavy Gunner x2 (Rank 5) on all heavy weapons. Demolition Expert x2 plus VATS x2 = 4x explosive damage. Bloody Mess adds flat 15%.
Survivability
X-01 Mk.V Power Armor (highest DR in base game). Lone Wanderer -30% damage taken. Medic Rank 4 fully restores HP. Solar Powered daytime radiation healing.
Boss
VATS explosive burst (4x base) plus sustained plasma DPS. Ejected Fusion Cores add free grenade damage.
Heavy Gunner
Heavy Gunner is the perk tree governing all oversized weapons, including miniguns, missile launchers, Gatling lasers, and heavy plasma guns. At Rank 5 the perk doubles all heavy weapon damage, with intermediate ranks adding hip-fire accuracy improvements and a stagger chance on Rank 4 hits.
Auto-fire configuration of the IPX-03 Phoenix. The High Rate Emitter mod delivers sustained energy damage at medium range, ideal for clearing groups and stacking damage on armored targets over time. Both Institute Plasma weapons are Creation Club content included in the Anniversary Edition.
Mods & Attachments
- ▸Photonic Plasma Agitator— Increases plasma projectile velocity and tightens shot grouping at rangeWiki
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Alternatives
- Gatling Laser (base-game alternative)Wiki
How to Obtain
The highest-tier power armor in the base game, fully upgraded to Mk.V at an armor workbench. The Databased mod on the helmet adds a data-processing bonus and the Optimized mod on both legs reduces AP cost while sprinting. Institute paint scheme, unlocked by completing the main story siding with the Institute, grants +1 Intelligence to all six pieces.
Mods & Attachments
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- ▸Optimized Leg Mods (Both Legs)— Reduces AP cost while sprinting in Power Armor. Applied to both left and right legs.Wiki
How to Obtain
Combat Strategy
- ▸Take combat chems (Jet, Psycho, Buffout) before entering a dungeon or boss encounter. Chemist Rank 4 makes them last three times longer, so one dose covers the entire fight.
- ▸Confirm a fresh Fusion Core is slotted before a major fight. Nuclear Physicist Rank 3 makes each core last twice as long, making mid-fight depletion unlikely even in extended encounters.
- ▸During outdoor daytime fights, Solar Powered grants +2 Strength and Endurance passively, boosting both carry weight and overall toughness with no action required.
- ▸Open with the auto-fire Agitated Institute Plasma Blaster against groups and standard enemies. Heavy Gunner Rank 5 doubles the base weapon damage on every shot.
- ▸Switch to the Charging Agitated IPX-03 Phoenix against armored elites and bosses. The Focusing Accelerator concentrates plasma for higher single-hit burst damage where sustained rate of fire matters less.
- ▸Keep Lone Wanderer active by traveling without a companion. The 30% incoming damage reduction and 25% outgoing damage bonus are always on as long as you stay solo.
- ▸Enter VATS and detonate grenades or mines through it to apply Demolition Expert Rank 4's double explosive damage. This stacks on the existing 100% explosive bonus, reaching effectively 4x base explosive damage per blast.
- ▸When a Fusion Core is near depletion, eject it from the Power Armor's rear port via Nuclear Physicist Rank 3. The ejected core detonates after four seconds as a free explosive with no inventory cost.
- ▸Use a Stimpak immediately if HP drops low. Medic Rank 4 fully restores all lost health instantly rather than applying a partial top-up, making each Stimpak a reliable full reset.
Sources
Verified: 2026-04-27 · All content is original with full credit to original creators.