Akuoumaru is a 4-Star Claymore that was introduced as part of the Watatsumi series of weapons in Version 2.2 on the Eptiome Invocation event. Akuoumaru has a %ATK substat, and a unique passive that powers up the damage of Elemental Bursts based on the energy cost of the user’s entire party. This makes it an attractive choice for characters with high burst costs.
About Akuoumaru
| Rarity | ⭐⭐⭐⭐ |
| Weapon Type | Claymore |
| Secondary Stat | ATK% |
| Refinement Passive | Watatsumi Wavewalker |
| Region | Inazuma |
| Series | Watatsumi Series |
How to get Akuoumaru in Genshin Impact?
Akuoumaru is an event exclusive 4 Star weapon. This means that the only way to obtain this weapon is by wishing on a banner which features this weapon. Unlike 5-star event exclusives, there is no true way to guarantee rolling it other than good luck and ample resources.
Upgrades
Ascension and Stats
| Ascension | Phase | Level | Base | ATK | 2nd Stat | (ATK) |
| 0✦ | 1/20 | 42 | 9% | |||
| 20/20 | 109 | 15.9% | ||||
| 1✦ | 20/40 | 135 | 15.9% | |||
| 40/40 | 205 | 23.2% | ||||
| 2✦ | 40/50 | 231 | 23.2% | |||
| 50/50 | 266 | 26.8% | ||||
| 3✦ | 50/60 | 292 | 26.8% | |||
| 60/60 | 327 | 30.4% | ||||
| 4✦ | 60/70 | 353 | 30.4% | |||
| 70/70 | 388 | 34.1% | ||||
| 5✦ | 70/80 | 414 | 34.1% | |||
| 80/80 | 449 | 37.7% | ||||
| 6✦ | 80/90 | 475 | 37.7% | |||
| 90/90 | 510 | 41.3% |
Ascension Materials
| Items Required | Amount |
| Weapon Ascension Materials | |
| 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 |
| Common Ascension Materials | |
| Concealed Claw | 15 |
| Concealed Unguis | 18 |
| Concealed Talon | 27 |
| Old Handguard | 10 |
| Kageuchi Handguard | 15 |
| Famed Handguard | 18 |
| Total Mora | 150000 |
Refinements
| Refinement | Effects |
| 1 | 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. |
| 2 | 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. |
| 3 | 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. |
| 4 | 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. |
| 5 | 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. |
Availability
| Method | Obtainability |
| Paimon’s Bargains | No |
| Crafting | No |
| Overworld | No |
| Events | No |
| Epitome Invocation | Only if featured |
| Wanderlust Invocation | No |
| Character Event Wish | No |
Appearance
Each weapon has two forms, one when it is initially summoned and another once it has reached a certain level of ascension. Once this occurs, the weapon will undergo a change in its design. Akuoumaru is a greatsword with an eye-catching mixture of silver, blue and turquoise.
Non-Ascended
Akuoumaru has a noticeable curve to its single edged blade, and a black and gold handle.
Ascended
The blue along Akuoumaru’s edge turns a deep shade of blue that resembles the stars reflecting off of the ocean’s waves
Story
This blade was once used by a mighty general of Watatsumi.
It is said that he only knew as much of swordsmanship as the "Getsumouun" and "Yuushio" styles he taught himself,
And yet by their grace was he never vanquished by any mortal in a duel or on the field of battle.
It is often said that snakes and fish are both cold-blooded. But cold-blooded creatures ever seek the promised land of warmth.
To see his people's dreams fulfilled, Omikami challenged the gathering storm clouds to war.
Amongst the people of Watatsumi bent upon conquest, a young man stood out from the rest.
His fearless valor won him great love in Watatsumi, and they named him Touzannou.
But after many years passed, his kingly name was forgotten, only to be replaced by the epithet by which his foes knew him:
"Akuou," the wicked fangs and claws of the Great Serpent, the savage, demonic invader of Yashiori Island...
The slaughter had hardened the young man into a warrior. But to him,
Only the wish he made before departing, a wish made upon the moon reflected in the waters beside the shrine, was eternal.
"One day, I shall set myself above Mt. Yougou, overlooking the palace of the Lord of Thunder."
"I will have a joyful showdown against the legendary Great Tengu of Yougou upon the roof of Tenshukaku."
"...And then I'll bring that tengu's mask back to Ayame and Mouun as a souvenir!"
At last, the tides washed all their dreams away like towers in the sand.
The tengu's mask, shining like a crimson star, was shattered like seashore gravel amidst the chaotic battle,
Nor would the shrine maiden who shone like moonlight into the young man's soul ever return again,
While the Akuou himself would face the blinding ray of lightning alongside the Great Serpent.
FAQs
Is Akuoumaru good?
Akuoumaru, similarly to the Lithic series, is a situational weapon that demands you be conscientious about how you build your team compositions as well as the type of character holding the weapon. A character needs to have a high damage output burst, as well as a team with a high average burst cost. Unfortunately this makes it rather niche, but it is powerful within its niche.
How does Akuoumaru work?
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. The maximum Elemental Burst capacity needed to max out its passive is 333.3 repeating energy
Who are good users of Akuoumaru?
Sayu is a solid candidate to use Akuoumaru thanks to her 80 energy cost burst, sizable multipliers on the ability, and the fact that she also heals based on the amount of ATK she has, making it an all around solid choice for her
Final Thoughts
Akuuomaru is niche in its optimal use cases as well as having poor availability due to being a unique weapon only available on the Epitome Invocation banner. If the conditions are perfect, it can be competitive with its other 4-star peers in heavy burst centric compositions. It is a relatively high bar to meet, however, so be sure you want to invest in it..
