Weapon details
Akuoumaru
Type: Claymore
Rarity: ★★★★ Base ATK: 42 ATK%: 9%
The beloved sword of the legendary "Akuou." The blade is huge and majestic, but is surprisingly easy to wield.
Passive effect
Watatsumi Wavewalker
R1
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.
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.
Cost per phase
Phase 0
Level cap: 20
Adventure rank required: -
Mora: -
Materials
-
Phase 1
Level cap: 40
Adventure rank required: 15
Mora: 5,000
Materials
Old Handguard x2 
Concealed Claw x3 
Coral Branch of a Distant Sea x3 Phase 2
Level cap: 50
Adventure rank required: 25
Mora: 15,000
Materials
Old Handguard x8 Concealed Claw x12 
Jeweled Branch of a Distant Sea x3 Phase 3
Level cap: 60
Adventure rank required: 30
Mora: 20,000
Materials
Kageuchi Handguard x6 
Concealed Unguis x6 Jeweled Branch of a Distant Sea x6 Phase 4
Level cap: 70
Adventure rank required: 35
Mora: 30,000
Materials
Kageuchi Handguard x9 Concealed Unguis x12 
Jade Branch of a Distant Sea x3 Phase 5
Level cap: 80
Adventure rank required: 40
Mora: 35,000
Materials
Famed Handguard x6 
Concealed Talon x9 Jade Branch of a Distant Sea x6 Phase 6
Level cap: 90
Adventure rank required: 50
Mora: 45,000
Materials
Famed Handguard x12 Concealed Talon x18 
Golden Branch of a Distant Sea x4