Operation: Floodgate Dungeon Guide Location, Boss Strategies, and Trash
Last Updated:Dec 1, 2025 - 7:00 PM
(6mo ago)
Petko
This page will cover everything you need to know about the Operation: Floodgate
Dungeon in the War Within Expansion, including strategies for events, trash, and
bosses.
This guide will be an extensive overview of the dungeon, providing vital information on how
to complete it across all difficulties. We will cover all 4 Boss fights, as well as the most
notable trash enemies in the
dungeon and their important abilities. If you would like to learn about the rest
of the dungeons in The War Within Season 3, please see our
overviews linked below. Otherwise, without further ado, let us begin!
To summon the Swampface (the third boss of the dungeon) and continue
forward, you must destroy the 5/5 Weapons Stockpile Explosion located through
the first area of the dungeon.
2.
Big M.O.M.M.A. and Trash Mobs in the Area
2.1.
Notable Trash Before Big M.O.M.M.A.
Interrupt Darkfuse HyenaBloodthirsty Cackle.
Use defensive cooldowns when Darkfuse Bloodwarper is casting Warp Blood.
Any spare interrupts should be used for Blood Blast.
Be aware of Mechadrone Sniper and their Snipe ability,
it deals a ton of damage! Any spare kicks should be placed on Trickshot.
Avoid being hit by Darkfuse Demolitionist's R.P.G.G..
Darkfuse Inspector will shadow step behind you with Surprise Inspection,
make sure to stay close to melee so they don't run away!
2.2.
Big M.O.M.M.A. Guide
2.2.1.
All Roles
Make sure to defeat the 4 Darkfuse Mechadrones and interrupt Maximum Distortion,
before the boss reaches maximum energy and casts Kill-o-Block Barrier.
Avoid being hit by the Sonic Boom.
Once you defeat the 4 Darkfuse Mechadrones, the boss will enter intermission via
Jumpstart, dealing damage to the whole party and taking 200% increased
damage (save your major cooldowns if you can!), after which he will erupt Excessive Electrification
and resume the encounter.
2.2.2.
Tank
Always do your best to position the boss around the 4 Darkfuse Mechadrones
and away from any Excessive Electrification ground patches.
2.2.3.
Healer
Use your major cooldowns during Jumpstart intermission.
If Kill-o-Block Barrier last too long, call out for external defensives
and use everything you have to keep your team alive.
3.
Demolition Duo and Trash Mobs in the Area
3.1.
Notable Trash Before Demolition Duo
Be mindful of the Loaderbot's Wind Up fixate. This can be
especially dangerous if you are a melee player!
Avoid Shreddinator 3000's Shreddation Sawblade and sidestep
the Flamethrower channel cast.
Use your defensives if Venture Co. Architect casts Nailed
on you, use defensive or a movement-impairing removal ability (like Paladin's Blessing of Freedom
or Monk's Tiger's Lust. When they cast Rapid Construction, focus their
construction as otherwise, they take reduced damage.
3.2.
Demolition Duo Boss Guide
3.2.1.
All Roles
Make sure to defeat both bosses simultaneously to avoid the Divided Duo
Enrage effect.
Use the Barreling Charge and Kinetic Explosive Gel to remove
the bombs. If you don't clear all the bombs before the timer runs out, they will deal massive
group-wide damage and apply Deflagration.
Dodge the incoming B.B.B.F.G. frontals from Keeza Quickfuse.
3.2.2.
Tank
Be careful as Bront will cleave targets in front of you with Wallop
frontal.
Always do your best to position both bosses together, allowing your team a better cleave.
3.2.3.
Healer
Dispel the Kinetic Explosive Gel on top of a bomb to remove them. Be mindful as
the debuff ticks hard, consider asking for a defensive.
Use all of your major healing cooldowns if a bomb goes through as the Deflagration
does immense damage.
4.
Swampface and Trash Mobs in the Area
4.1.
Notable Trash Before Swampface
Be mindful at the quantity of Bombshell Crabs you are pulling as upon death they will
detonate Crabsplosion - a group-wide stackable DoT effect.
Interrupt Disturbed Kelp's Restorative Algae and use your crowd-control
when they cast Jettison Kelp.
4.2.
Swampface Boss Guide
4.2.1.
All Roles
Razorchoke Vines is the main mechanic to play around, as it will bind
4 random players (2 by 2). Your goal is to avoid being hit by Mudslide
frontal and the incoming waves coming from Awaken the Swamp without breaking
the 14 yards binding (else you will be pulled in together and likely die).
Organize prior to engaging the boss, at what direction exactly you will be moving to avoid
the Mudslide.
4.2.2.
Tank
Use your active mitigation when Swampface casts Sludge Claws.
4.2.3.
Healer
Use your major healing cooldowns to heal through the Awaken the Swamp
as it will do group-wide damage.
5.
Geezle Gigazap and Trash Mobs in the Area
5.1.
Notable Trash Before Geezle Gigazap
HIGH PRIORITY Interrupt Venture Co. Electrician's Lightning Bolt.
Your healer must focus on dispelling Overcharge DoT as swiftly as they can.
Darkfuse Jumpstarter is the hardest non-boss-enemy in this dungeon, as they will
periodically do continuous group-wide damage while spawning Battery Discharge
lighting puddles (which you must avoid otherwise you will die).
5.2.
Geezle Gigazap Boss Guide
5.2.1.
All Roles
Use defensive cooldowns during Turbo Charge and dodge
the incoming frontals.
Avoid the Dam Rubble ground puddles.
If targeted by Gigazap, stay away from any water puddles
to avoid electrifying them. This will help you with a follow-up boss ability -
Leaping Sparks as the only way to remove it is through leading the
spark onto a fresh water puddle.
5.2.2.
Tank
Use your major defensive cooldowns before each Thunder Punch.
5.2.3.
Healer
Use your major healing cooldowns during the Turbo Charge channel,
as it will deal massive group-wide damage.
6.
Operation Floodgate Loot Table
6.1.
Big M.O.M.M.A.
Type
Item
Stats
Warglaives
Sonic Ka-BOOM!-erang
Haste/Crit
Leather Shoulder
Mechanized Junkpads
Vers/Haste
Mail Shoulder
Skystreak's Hidden Missiles
Crit/Mastery
Cloth Boots
Nonconductive Kill-o-Socks
Vers/Haste
Trinket
Darkfuse Medichopper
Int
6.2.
Demolition Duo
Type
Item
Stats
Gun
Keeza's 'B.' B.B.B.F.G
Crit/Haste
Leather Head
Waterworks Filtration Mask
Haste/Crit
Mail Chest
Bront's Singed Blastcoat
Mastery/Haste
Plate Waist
Venture Contractor's Floodlight
Crit/Haste
Trinket
Improvised Seaforium Pacemaker
Str/Agi
6.3.
Swampface
Type
Item
Stats
Polearm
Gallytech Turbo-Tiller
Mastery/Crit
Plate Chest
Muckdiver's Wading Plate
Mastery/Crit
Leather Wrist
Disturbed Kelp Wraps
Mastery/Haste
Cloth Legs
Razorchoke Slacks
Crit/Mastery
Trinket
Ringing Ritual Mud
Vers
6.4.
Geezle Gigazap
Type
Item
Stats
2H Sword
Circuit Breaker
Haste/Mastery
Dagger
Geezle's Coercive Volt-ohmmeter
Agi, Haste/Vers
Back
Electrician's Siphoning Filter
Haste/Mastery
Cloth Chest
Saboteur's Rubber Jacket
Haste/Crit
Plate Hands
Jumpstarter's Scaffold-Scrapers
Mastery/Haste
Mail Waist
Portable Power Generator
Haste/Crit
Trinket
Gigazap's Zap-Cap
Int
7.
Operation Floodgate Achievements
There are 4 total achievements to obtain in Operation Floodgate:
Achievement
Criteria
Operation: Floodgate
Defeat Geezle Gigazap in Operation Floodgate.
Heroic: Operation: Floodgate
Defeat Geezle Gigazap in Operation Floodgate on
Heroic difficulty or higher.
Mythic: Operation: Floodgate
Defeat Geezle Gigazap in Operation Floodgate on
Mythic or Mythic Keystone difficulty.
Keystone Hero: Operation: Floodgate
Complete Operation Floodgate at Mythic Level 10 or higher,
within the time limit. Reward, Teleport to Operation Floodgate.
Petko
Guide Author
Follow Petko
This guide has been written by Petko, one of the top Mythic+ players of all time.
He has accomplished several Rank 1 World & Europe Team and Solo seasonal
rankings, with multiple classes over the span of multiple expansions. You can catch his daily streams on
Twitch, and find many of his educational videos on
YouTube and TikTok.
8.
Changelog
18 Jan. 2026: Reviewed and updated for Midnight Pre-Patch.
01 Dec. 2025: Reviewed and updated for Patch 11.2.7.
04 Oct. 2025: Reviewed and updated for Patch 11.2.5.
04 Aug. 2025: Reviewed and updated for Season 3.
14 Jun. 2025: No further changes required for 11.1.7 Patch.
15 Apr. 2025: No further changes required for 11.1.5 Patch.