Akuoumaru

The beloved sword of the legendary "Akuou." The blade is huge and majestic, but is surprisingly easy to wield.

At a glance

Akuoumaru is a 4-star Claymore released in Version 2.2. At Level 90, it has 510 Base ATK and 41.3% ATK. Its Watatsumi Wavewalker passive is documented from R1 to R5.

Rarity: 4 stars
Type: Claymore
Maximum level: 90
Release version: 2.2

Lunaris data: version 7.1.0 (latest version reported by the source at import: 7.1.0), generated on September 22, 2026.This is the catalog generation date. Build guides separately state when their recommendations were checked.

Progression

Stats at level 90

Level

190

Base ATK: 510
ATK: 41.3%

Passive effect

Watatsumi Wavewalker

Refinement

For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.12%. A maximum of 40% increased Elemental Burst DMG can be achieved this way.

Progression

Ascension materials

Total ascension cost. Level-up EXP and Mora, and extra copies for refinement, are not included.

Mora for ascensions: 150,000

Old Handguard
× 10
Kageuchi Handguard
× 15
Famed Handguard
× 18
Concealed Claw
× 15
Concealed Unguis
× 18
Concealed Talon
× 27
Coral Branch of a Distant Sea
× 3
Jeweled Branch of a Distant Sea
× 9
Jade Branch of a Distant Sea
× 9
Golden Branch of a Distant Sea
× 4

Names source: Lunaris

Progression

Stats by level

Stored values at the main progression milestones from level 1 to 90.

Level	Base ATK	ATK
1	42	9%
20	109	15.9%
40	205	23.2%
50	266	26.8%
60	327	30.4%
70	388	34.1%
80	449	37.7%
90	510	41.3%

Watatsumi Wavewalker

R1–R5 refinement effects

Every refinement is visible together for direct comparison.

R1

R2

For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.15%. A maximum of 50% increased Elemental Burst DMG can be achieved this way.

R3

For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.18%. A maximum of 60% increased Elemental Burst DMG can be achieved this way.

R4

For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.21%. A maximum of 70% increased Elemental Burst DMG can be achieved this way.

R5

For every point of the entire party's combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.24%. A maximum of 80% increased Elemental Burst DMG can be achieved this way.

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