Operation Stronghold Defense

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This page contains information about a past event that may or may not return in a future version.

Operation Stronghold Defense is an Event in Version "Luna V".

Event Details

Duration

• 2026/03/23 10:00 – 2026/04/02 03:59

Requirements

• Adventure Rank 20 or above
• Complete Archon Quest Prologue: Act III "Song of the Dragon and Freedom"
• Complete the Archon Quest "True Moon" first to get the best experience from this event.

Summary

• On the first day of the event, 2 stages will be unlocked. Subsequently, 1 new stage will be unlocked each day, for a total of 6 stages.
• During the event period, complete the corresponding stage challenges to obtain the respective rewards.

Tutorial

During the challenge, Traveler needs to set up various mechanisms and defeat opponents to ensure that the stronghold is protected from destruction.

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Different upgrade options may be chosen for different mechanisms. Different options may be combined to create varied mechanism effects.

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Upgraded mechanisms can be refitted with other upgrade options at any time by consuming Bolts.

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After an enemy launches an attack, Support Skills can be used to help defeat them. Support Skill energy recovers slowly over time. Collection mechanisms can accelerate the recharge rate.

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After completing specific wave challenges, you may select Protocols. Protocols will strengthen your firepower or increase the efficiency of obtaining Bolts.

Stages

Operation Stronghold Defense

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A grand stronghold gate. It is said the stronghold holds countless supplies, making it a prime target for monsters.

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Map description

I — First Battle! Support From a Warmhearted Weasel

Unlocks 2026-03-23 10:00

Opponents This Round

— Eroding Avatar of Lava

— Oceanid Finch

— Blazing Axe Mitachurl

— Hilichurl Fighter

Available Mechanisms

— Energy Turret

— Trap Mechanism

Rewards

Objective	Rewards
Fend off 2 waves of opponents	70 2
Fend off 3 waves of opponents	20,000 2
Fend off 4 waves of opponents	4 2

Dialogue

II — Got 'Em! Mechanism Supplies

Unlocks 2026-03-23 10:00

Opponents This Round

— Frostarm Lawachurl

— Eroding Avatar of Lava

— Cryo Abyss Mage

— Hydro Abyss Mage

— Oceanid Finch

— Hydro Samachurl

— Blazing Axe Mitachurl

— Hilichurl Fighter

Available Mechanisms

— Energy Turret

— Trap Mechanism

— Collection Mechanism

Rewards

Objective	Rewards
Fend off 4 waves of opponents	70 2
Fend off 5 waves of opponents	20,000 2
Fend off 6 waves of opponents	4 2

III — Transformation? A Cunning New Trick

Unlocks 2026-03-24 04:00

Opponents This Round

— Stonehide Lawachurl

— Tenebrous Mimesis — Crackling Axe Mitachurl

— Eroding Avatar of Lava

— Cryo Abyss Mage

— Large Geo Slime

— Hydro Samachurl

— Blazing Axe Mitachurl

— Hilichurl Fighter

Available Mechanisms

— Energy Turret

— Trap Mechanism

— Collection Mechanism

Rewards

Objective	Rewards
Fend off 4 waves of opponents	70 2
Fend off 5 waves of opponents	20,000 2
Fend off 6 waves of opponents	4 2

IV — Energy! A Reliable Partner

Unlocks 2026-03-24 04:00

Opponents This Round

— Wilderness Hunter

— Thunderhelm Lawachurl

— Frostarm Lawachurl

— Eroding Avatar of Lava

— Cryo Abyss Mage

— Hydro Abyss Mage

— Wilderness Exile

— Large Pyro Slime

— Oceanid Finch

Available Mechanisms

— Energy Turret

— Trap Mechanism

— Collection Mechanism

Rewards

Objective	Rewards
Fend off 4 waves of opponents	70 2
Fend off 5 waves of opponents	20,000 2
Fend off 6 waves of opponents	4 2

V — Traps? The Key to Stopping Enemies

Unlocks 2026-03-25 04:00

Opponents This Round

— Oprichniki Fireblade Shock Trooper

— Wilderness Hunter

— Thunderhelm Lawachurl

— Frostarm Lawachurl

— Tenebrous Mimesis — Crackling Axe Mitachurl

— Eroding Avatar of Lava

— Oceanid Finch

— Large Pyro Slime

Available Mechanisms

— Energy Turret

— Trap Mechanism

— Collection Mechanism

Rewards

Objective	Rewards
Fend off 4 waves of opponents	70 2
Fend off 5 waves of opponents	20,000 2
Fend off 6 waves of opponents	4 2

Showdown! Endless Foes Incoming!

Unlocks 2026-03-27 04:00

Opponents This Round

— Oprichniki Fireblade Shock Trooper

— Wilderness Hunter

— Frostarm Lawachurl

— Stonehide Lawachurl

— Thunderhelm Lawachurl

— Tenebrous Mimesis — Crackling Axe Mitachurl

— Eroding Avatar of Lava

— Oceanid Finch

— Large Pyro Slime

— Large Geo Slime

Available Mechanisms

— Energy Turret

— Trap Mechanism

— Collection Mechanism

Rewards

Objective	Rewards
Fend off 4 waves of opponents	70 2
Fend off 5 waves of opponents	20,000 2
Fend off 6 waves of opponents	4 2

Support Skills

AoE Skill

Name		Description
	Whoosh-Whoosh Tornado	Summons a vortex that continuously deals Anemo DMG to opponents within its AoE.
	Boom-Boom Fireball	Shoots a fireball that deals massive Pyro DMG to opponents within its AoE.
	Rumble-Rumble Rainstorm	Unleashes rainfall within an area, applying Wet and a stackable Movement SPD Reduction to all opponents within its AoE. At the same time, deal Hydro DMG.
	Thump-Thump Earthwave	Triggers an earthquake that deals high-frequency Geo DMG to opponents within its AoE, reducing their Movement SPD.

Global Skill

Name		Description
	Crackle-Crack Thunderstrike	Strikes all opponents on the field with a Thunderstrike that deals Electro DMG.
	Whish-Whish Blizzard	Freezes all opponents on the field.

Mechanisms

— Energy Turret	Elemental Infusion
	Pyro Launches Pyro Projectiles	Electro Launches Electro Projectiles	Anemo Launches Anemo Projectiles
	Mechanism Enhancement
	Fire Intensity Reduces the ATK of each shot, and changes the fire mode to 3-shot burst mode.	DMG Range Fires an explosive bullet that deals DMG to the target and even splash damage to other opponents within range.	Standby Munitions Standby munitions can be stocked continuously (at the rate of 1 every 3s, up to 3 max). Munition ATK power is greatly increased, and the fire mode is changed to a burst that fires all stocked munitions at once.
	Upgrade Function
	Target Analysis Marks the current target and reduces its Elemental RES by 20%. The target also takes an additional instance of True DMG when hit. This effect can be triggered once every 3s.	Suppressing Fire Unleashes an AoE Elemental attack. The higher the target's current HP percentage, the higher the DMG this attack deals. This effect can be triggered once every 7s.	Focused Attack Fires a single-target beam. The lower the target's current HP percentage, the higher the DMG this beam deals. This effect can be triggered once every 7s.
— Trap Mechanism	Elemental Infusion
	Hydro Deals Hydro DMG and applies Hydro to opponents.	Cryo Deals Cryo DMG and applies Cryo to opponents.	Geo Deals Geo DMG to opponents, and reduces their Elemental RES by 15% for 2s. Max 5 stacks, each stack's duration is independent.
	Mechanism Enhancement
	Pulling Mechanism Can pull opponents towards the center of the trap. This effect can be triggered once every 5s.	Minelaying Mechanism Can continuously produce mines that explode when opponents enter the trap, dealing massive DMG.	Shockwave Mechanism Can unleash a wide range of Elemental Shockwaves. The type of DMG dealt by the shockwave depends on the trap mechanism's Elemental Type.
	Upgrade Function
	Shackling Mechanism Opponents hit by it will be shackled for 3s. This effect can be triggered once every 10s.	Explosive Mechanism When an opponent is defeated within its attack range, it will unleash a shockwave, dealing high Elemental DMG to opponents within range. This effect can be triggered once every 1s.	Fracturing Mechanism Reduces the DEF of all opponents attacked by 15% for 2s. Max 5 stacks, each stack's duration is independent.
— Collection Mechanism	Filter Resources
	Bolt Preference Bolts dropped by opponents that are defeated in the range of collection mechanisms will be increased by an additional 20%. This effect cannot stack.	Energy Preference Charge your Support Skill(s) when opponents are defeated in the range of collection mechanisms. This effect cannot stack.
	Enhance Collection
	Collection Amount Increases Increase Resource Collection Amount by 100%

Enemies

Elite Opponents

Name	Description
— Frostarm Lawachurl	Pyro has an advantage A resilient elite opponent. It can apply a Cryo Frost Armor to itself. While the Frost Armor exists, the Frostarm Lawachurl will take less damage. This opponent recovers 30% HP when its HP falls below 20% for the first time.
— Stonehide Lawachurl	Geo has an advantage A resilient elite opponent. It will apply a Geo Ward to itself when entering the field. While the Ward exists, the Stonehide Lawachurl will take less damage. Deal Geo DMG to quickly break the Ward. This opponent will taunt the energy turrets around it periodically.
— Thunderhelm Lawachurl	Cryo has an advantage A resilient elite opponent. It will apply an Electro Ward to itself when entering the field. While the Ward exists, the Thunderhelm Lawachurl will take less damage. This opponent will periodically force turrets around it to stop attacking.
— Tenebrous Mimesis — Crackling Axe Mitachurl	High-Frequency attacks have an advantage A fast-moving, elite opponent. It is protected by a Void Ward. Sustain high-frequency attacks to break the Ward, leaving the opponent in a state of Confusion. When its HP falls below 20% for the first time, it gains 70% damage reduction.
— Wilderness Hunter	Focused attacks have an advantage A fast-moving, elite opponent. It can only be suppressed by depleting its Max HP completely. Enhance your ability to suppress low-HP opponents to effectively deal with these opponents. After defeating it, it affects all nearby turrets, reducing their ATK by 50%.
— Oprichniki Fireblade Shock Trooper	Focused attacks have an advantage A resilient elite opponent. It continuously summons Oprichniki Line Troopers to attack the stronghold. When other enemies are present nearby, it gains 70% DMG Reduction.
— Eroding Avatar of Lava	Pyro has an advantage A slow-moving but extremely resilient elite opponent. It will self-destruct after taking multiple instances of Pyro DMG. When its HP falls below 20% for the first time, it recovers 30% HP.

Normal Opponents

Name	Description
— Blazing Axe Mitachurl	A normal, slow-moving opponent
— Oceanid Finch	Cryo has an advantage A normal, fast-moving opponent. Immune to Hydro DMG. When defeated, it will release a shockwave, dealing AoE Hydro DMG.
— Hilichurl Fighter	A normal, slow-moving, and vulnerable opponent. Usually attacks in groups.
— Large Pyro Slime	Electro has an advantage A normal, slow-moving opponent. Immune to Pyro DMG. Applies Pyro periodically to other opponents within range. When defeated, it will release a shockwave, dealing AoE Pyro DMG.
— Large Geo Slime	Geo has an advantage A normal, slow-moving opponent. It will apply a Geo Ward to itself when entering the field. Deal Geo DMG to quickly break the Ward.
— Cryo Abyss Mage	Pyro has an advantage A normal, vulnerable opponent. It will apply a Cryo Ward to itself when entering the field. When the Ward is broken, it temporarily enters a weakened state.
— Hydro Abyss Mage	Cryo has an advantage A normal, vulnerable opponent. It will apply a Hydro Ward to itself when entering the field. When the Ward is broken, it temporarily enters a weakened state.
— Wilderness Exile	Focused attacks have an advantage A normal, slow-moving opponent. It can only be suppressed by depleting its Max HP completely. Enhance your ability to suppress low-HP opponents to effectively deal with these opponents.
— Hydro Samachurl	AoE attacks have an advantage A normal, slow-moving opponent that periodically heals opponents around it.
— Oprichniki Line Trooper	A normal, fast-moving opponent that appears after being summoned by Oprichniki Fireblade Shock Troopers.

Protocols

Firepower Protocol

Name		Description
	Iceshatter Strike	When the Frozen status ends, opponent(s) will take True DMG equal to 10% of their current HP.
	Melting Snow	When you trigger Melt upon opponent(s), they will be defeated instantly if their current HP is below 20% of their Max HP.
	Deep Freeze Conduction	When you trigger Superconduct upon opponent(s), an explosion will occur at the target location, dealing Cryo DMG and applying Cryoto [sic] nearby opponents within its AoE. This effect can be triggered once every 6s.
	Overload Aftershock	When you trigger Overloaded upon opponent(s), an explosion will occur at the target location, dealing to opponents within its AoE Pyro True DMG equal to 10% of their Max HP. This effect can be triggered once every 6s.
	Conductive Rod	When you trigger Electro-Charged upon opponent(s), 5 Thunderstrikes will descend upon the target location, dealing multiple instances of Electro DMG. This effect can be triggered once every 6s.
	Steam Stream	When you trigger Vaporize upon opponent(s), they will take multiple additional instances of Hydro DMG. This effect can be triggered once every 6s.
	Enhanced Mechanism	Increase ATK of energy turrets and trap mechanisms by 10%.
	Pressurized Device	At the start of each wave, temporarily increase ATK of energy turrets and trap mechanisms by 5% every 10s. At each wave, you can temporarily increase ATK by up to 20% this way.
	Afterburn Chamber	At the start of each wave, temporarily increase ATK of energy turrets and trap mechanisms by 15% for 60s.
	Suppressive Fire	Opponents will lose HP equal to 10% of their Max HP upon entering the field.
	Decoy Tactics	When you have 10 or fewer mechanisms on the field, opponents will lose HP equal to 15% of their Max HP upon entering the field.
	Empty Fort Tactics	When you have 8 or fewer mechanisms on the field, opponents will lose HP equal to 20% of their Max HP upon entering the field.

Collection Protocol

Name		Description
	Passive Income	At the start of each wave's preparation phase, you gain 100 extra Bolts.
	Assault Efficiency	At the start of each wave's preparation phase, gain Bolts based on the number of energy turrets and trap mechanisms on the field. Each mechanism can provide 25 Bolts. You can gain up to 200 Bolts this way.
	Collection Efficiency	At the start of each wave's preparation phase, gain Bolts based on the number of collection mechanisms on the field. Each collection mechanism can provide 100 Bolts. You can gain up to 200 Bolts in this way.
	Budget Deployment	Reduce the Bolts required to deploy, upgrade, and refit mechanisms by 10%.
	Focused Deployment	Reduce the Bolts required to deploy, upgrade, and refit mechanisms by 15%, but the rate at which Support Skill energy restores over time is reduced by 50%.
	Excessive Deployment	Reduce the Bolts required to deploy, upgrade, and refit mechanisms by 20%, but Support Skill energy can only be obtained through collection mechanisms.
	Collect 'Em All	The collection range of collection mechanisms will expand to the entire field (their effects cannot stack).
	Collection Proficiency	Increase the collection efficiency for collection mechanisms by 50%.
	Lavish Collection	Increase the collection efficiency for collection mechanisms by 100%, but the Bolts required to deploy and upgrade mechanisms are increased by 50%.

Trial Protocol

Name		Description
	Reserve Squad	Immediately obtain 200 Bolts.
	Resilient Foes: Very Hard	In this wave, all opponents' max HP is increased by 40%, but 350 Bolts can be obtained at the start of the next wave.
	Resilient Foes: Dire	In this wave, the Max HP of all opponents is increased by 40%. If you defeat all opponents in this wave, you will obtain 500 Bolts at the start of the next wave.
	Heavy-Armored Foes: Very Hard	In this wave, opponents' All Elemental RES is increased by 15%. However, obtain 350 Bolts at the start of the next wave.
	Heavy-Armored Foes: Dire	In this wave, opponents' All Elemental RES is increased by 25%. However, if you defeat all opponents in this wave, obtain 500 Bolts at the start of the next wave.
	Siege Expert: Very Hard	In this wave, opponents deal 1 more DMG to stronghold endurance. However, obtain 350 Bolts at the start of the next wave.
	Siege Expert: Dire	In this wave, opponents deal 100% more DMG to stronghold endurance. However, if you defeat all opponents in this wave, obtain {1} Bolts at the start of the next wave.
	Unstable Foundation: Very Hard	In this wave, the Bolts required to deploy, upgrade, and refit your mechanisms will be increased by 25%. However, at the start of the next wave, obtain 350 Bolts.
	Unstable Foundation: Dire	In this wave, the Bolts required to deploy, upgrade, and refit your mechanisms will be increased by 50%. However, if you defeat all opponents in this wave, obtain 500 Bolts at the start of the next wave.
	Bounty Notice: Smashed Stone	In this wave, additional bounty target(s) will appear: Large Geo Slime. Defeat all bounty targets to obtain 350 Bolts at the start of the next wave.
	Bounty Notice: Giant Boulder	In this wave, additional bounty target(s) will appear: Stonehide Lawachurl. Defeat all bounty targets to obtain 500 Bolts at the start of the next wave.
	Bounty Notice: Sharp Axe	In this wave, additional bounty target(s) will appear: Blazing Axe Mitachurl. Defeat all bounty targets to obtain 350 Bolts at the start of the next wave.
	Bounty Notice: Tenebrosity	In this wave, additional bounty target(s) will appear: Tenebrous Mimesis - Crackling Axe Mitachurl. Defeat all bounty targets to obtain 500 Bolts at the start of the next wave.

Battle Pass Missions

This event added additional "This BP Period" Battle Pass missions to the Northerly Winds Battle Pass. The Battle Pass EXP (BP EXP) obtained from these missions do not count towards the weekly experience limit of 10,000 BP EXP.

Missions	BP EXP
[Event] Fend off 6 waves of opponents in "Showdown! Endless Foes Incoming!" of "Operation Stronghold Defense"	1,500

Total Rewards

420 Primogem

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