Where Waves Meet the Reef/Pneumousia Barrage Countermeasure

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Pneumousia Barrage Countermeasure

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As part of their trade expo project, Navia and Clorinde have hidden unique mechanisms at the event venue. Through a dedicated relay system, both the barrage-firing mechanisms and participating combatants can harness Pneumousia during combat drills.

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Map Description

Pneumousia Barrage Countermeasure is a part of the Where Waves Meet the Reef event.

It is unlocked by completing the Event Story Quest The Top Dog of the Criminal Underworld in Where Waves Meet the Reef: Part I - A Commission From the Curatorium of Secrets and accessed from the icon by talking to Navia.

Tutorial

In Pneumousia Barrage Countermeasure, Travelers will equip an Experimental Shield which can alternate between Pneuma and Ousia to counter the incoming barrage.

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When the Experimental Shield comes into contact with a barrage of a different alignment, the Traveler takes DMG due to the annihilation reaction, losing Action Points. When coming into contact with a barrage of the same alignment, the Experimental Shield will absorb it and convert it into energy for attacks.

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Up to 3 stacks of energy can be stored. Each time an attack is launched, consume 1 stack of energy to fire a homing attack at the nearest opponent. The alignment of this attack is the same as the current alignment of the Experimental Shield. When the attack's Pneuma or Ousia alignment is opposite to that of the opponent, it can deal thrice the DMG.

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Certain heavily armored opponents and the strong Lord-type opponent each possess an Elite Ward with Pneuma or Ousia alignments. Only attacks with an alignment opposite to the Ward's can break it.

Stages

I — The Secret of the Light-Footed Stride

Unlocks 2026-04-27 10:00

Challenge Mechanics

Linear Shell
Barrage-firing mechanisms will continuously fire projectiles to attack. Pay attention to the trajectory of the projectiles!

Challenge Overview

Primary Opponent(s)

Icon	Name & Description
	Rhythm Mechanism: Heavy Fires projectiles forward that match its own pneuma-ousia alignment. Additionally, it's equipped with an Elite Ward of the same alignment, which can only be broken with attacks of the opposite alignment.
	Rhythm Mechanism: Standard Fires projectiles forward that match its own pneuma-ousia alignment.

Stage Items

Icon	Name & Description
	Recovery Aid Restores Action Points when obtained.
	Speed Aid Increases Movement SPD for a period of time when obtained.

Rewards

Objective	Rewards
Complete the challenge	30 50 2
Complete the challenge with 3 or more Action Points remaining	40 30,000 3
Complete the challenge with 6 or more Action Points remaining	30 30,000 3

II — Unwavering Focus

Unlocks 2026-04-28 04:00

Challenge Mechanics

Split Shell
The projectiles fired by these barrage-firing mechanisms will explode and split after a short delay. Keep an eye on where the projectiles land and when they explode.

Challenge Overview

Primary Opponent(s)

Icon	Name & Description
	Burststep Mechanism: Heavy Fires projectiles that match its own pneuma-ousia alignment. After a short delay, the projectiles explode, split, and disperse outward. Additionally, it's equipped with an Elite Ward of the same alignment, which can only be broken with attacks of the opposite alignment.
	Burststep Mechanism: Standard Fires projectiles that match its own pneuma-ousia alignment. After a short delay, the projectiles explode, split, and disperse outward.

Stage Items

Icon	Name & Description
	Recovery Aid Restores Action Points when obtained.
	Speed Aid Increases Movement SPD for a period of time when obtained.

Rewards

Objective	Rewards
Complete the challenge	30 50 2
Complete the challenge with 3 or more Action Points remaining	40 30,000 3
Complete the challenge with 6 or more Action Points remaining	30 30,000 3

III — Do Not Touch the Borderline

Unlocks 2026-04-29 04:00

Challenge Mechanics

Beam Attack
Barrage-firing mechanisms will launch beam attacks once the alert ends. Beams can reflect off objects' surfaces in the field. So, pay attention to the beam alert and the trajectories of reflected beams!

Challenge Overview

Primary Opponent(s)

Icon	Name & Description
	Prohibition Beam Mechanism: Heavy Fires a beam that matches its own pneuma-ousia alignment. Additionally, it's equipped with an Elite Ward of the same alignment, which can only be broken with attacks of the opposite alignment.
	Prohibition Beam Mechanism: Standard Fires a beam that matches its own pneuma-ousia alignment.

Stage Items

Icon	Name & Description
	Ad-Hoc Cover Appears and disappears periodically. It can block attacks from both sides and reflect beams. Use it to keep situations from turning too sticky...
	Recovery Aid Restores Action Points when obtained.
	Speed Aid Increases Movement SPD for a period of time when obtained.

Rewards

Objective	Rewards
Complete the challenge	30 50 2
Complete the challenge with 3 or more Action Points remaining	40 30,000 3
Complete the challenge with 6 or more Action Points remaining	30 30,000 3

IV — Following the Rhythm and Trail

Unlocks 2026-04-30 04:00

Challenge Mechanics

Homing Shell
Barrage-firing mechanisms will fire homing projectiles. Use objects in the field to take cover from attacks and find the right moment to counterattack!

Challenge Overview

Primary Opponent(s)

Icon	Name & Description
	Skitter-Tracker Mechanism: Heavy Fires homing projectiles that match its own pneuma-ousia alignment. Additionally, it's equipped with an Elite Ward of the same alignment, which can only be broken with attacks of the opposite alignment.
	Skitter-Tracker Mechanism: Standard Fires homing projectiles that match its own pneuma-ousia alignment.

Stage Items

Icon	Name & Description
	Ad-Hoc Cover Appears and disappears periodically. It can block attacks from both sides and reflect beams. Use it to keep situations from turning too sticky...
	Recovery Aid Restores Action Points when obtained.
	Speed Aid Increases Movement SPD for a period of time when obtained.

Rewards

Objective	Rewards
Complete the challenge	30 50 2
Complete the challenge with 3 or more Action Points remaining	40 30,000 3
Complete the challenge with 6 or more Action Points remaining	30 30,000 3

The Lord's Resplendent Waltz

Unlocks 2026-04-30 04:00

Challenge Mechanics

Comprehensive Challenge
The most powerful Lord-type barrage-firing mechanism will use various projectiles and beams in its attacks. It can also summon support mechanisms to assist in battle. Apply everything you've learned so far to defeat it!

Challenge Overview

Primary Opponent(s)

Icon

Name & Description

Pneuma-Ousia Waltz Lord: Type III The most powerful Lord-type mechanism presented at this event, capable of using various projectiles and beams in its attacks. It can also summon support mechanisms to assist in battle. It's equipped with an Elite Ward of the same alignment, which can only be broken with attacks of the opposite alignment. During combat, it periodically switches between the Pneuma and Ousia alignments, with its attack and Ward alignments also switching accordingly.

Stage Items

Icon	Name & Description
	Recovery Aid Restores Action Points when obtained.
	Speed Aid Increases Movement SPD for a period of time when obtained.

Rewards

Objective	Rewards
Complete the challenge	30 50 1
Complete the challenge with 3 or more Action Points remaining	40 30,000 6
Complete the challenge with 6 or more Action Points remaining	30 30,000 3

Dialogue

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