In the ever-evolving world of Teyvat, where flashy 5-star weapons often steal the spotlight, the 4-star claymore Akuoumaru has been quietly waiting in the wings like a seasoned actor ready for their breakout role. As of 2026, this event-wish exclusive weapon remains a hidden gem for savvy players who understand that sometimes, the best tools aren't the shiniest, but the smartest. Akuoumaru doesn't just increase your attack; it supercharges your Elemental Burst damage based on your team's total energy capacity, making it a strategic choice for characters who live and die by their ultimate moves. Think of it as the secret sauce that can turn a decent character into a powerhouse, all without breaking the bank on the gacha system.

What Is Akuoumaru?

Akuoumaru is not your average beatstick. This 4-Star Claymore is a wish-exclusive weapon, meaning you can't forge it or find it in a chest; you have to summon it from the limited-time banners. Its primary stat boost is a straightforward 9% increase to the wielder's ATK. However, its true magic lies in its passive skill, 'Watatsumi Wavewalker'. This ability is as subtle and powerful as a deep ocean current. For every single point of your entire party's combined maximum Energy capacity, the equipped character's Elemental Burst damage gets a 0.12% bump. This effect can stack up to a whopping 40% increased Burst damage. That's like attaching a rocket booster to your character's ultimate move! 🚀

This makes Akuoumaru the perfect fit for two types of characters:

• The Burst Bombers: Characters whose entire purpose is to drop a massive, screen-clearing Elemental Burst.

• The Hybrid Hitters: Characters with strong Normal and Charged Attacks who also pack a punch with their Burst. The ATK% boost juices up their basic attacks, while Watatsumi Wavewalker turns their Burst into a finishing move as devastating as a rogue wave.

It's an underrated weapon that, in the right hands, functions less like a sword and more like a carefully calibrated energy capacitor, storing power from your team to unleash a single, catastrophic blow.

How To Get & Ascend Akuoumaru

Getting your hands on Akuoumaru requires a bit of luck and a stash of Primogems. It appears on the Epitome Invocation Weapon Banner during specific updates. While its drop rate as a featured 4-star weapon is increased (around 75% chance every 10 pulls), the gacha system is as fickle as a cat's affection. You are not guaranteed to get it. When you pull a 4-star on the weapon banner, you're guaranteed one of the featured 4-stars, which usually includes a mix of weapon types. It's a bit like ordering a mystery box; you know you'll get a toy, but it might not be the one you wanted. 😼

Once you've successfully wished it into your inventory, the real work begins: Ascension. To unleash Akuoumaru's full potential, you'll need to gather a specific set of materials from Inazuma. Here’s the complete breakdown of what you need, presented in a handy table for the modern, efficiency-minded Traveler:

Ascension Phase	Materials Required
20 → 40	2x Old Handguard, 3x Coral Branch of a Distant Sea, 3x Concealed Claw
40 → 50	8x Old Handguard, 3x Jeweled Branch of a Distant Sea, 12x Concealed Claw
50 → 60	6x Kageuchi Handguard, 6x Jeweled Branch of a Distant Sea, 6x Concealed Unguis
60 → 70	9x Kageuchi Handguard, 3x Jade Branch of a Distant Sea, 12x Concealed Unguis
70 → 80	6x Famed Handguard, 6x Jade Branch of a Distant Sea, 9x Concealed Talon
80 → 90	12x Famed Handguard, 4x Golden Branch of a Distant Sea, 18x Concealed Talon

Farm Spots:

• Handguards: Dropped by the wandering Nobushi samurai all over Inazuma. Prepare for a lot of chasing.

• Branches of a Distant Sea: Forged from domain rewards in the Domain of Forgery: Sunken Sands (Tuesday/Friday/Sunday).

• Concealed Claws/Unguis/Talons: Harvested from the spectral Riftwolves that haunt Inazuma's shores. Fighting them is about as fun as a root canal, but necessary.

Recommended Characters For Akuoumaru

Akuoumaru is a versatile weapon, suitable for both Main DPS and Sub-DPS roles. The key question is: Does your character's damage profile look like a one-trick pony focused on their Burst, or a well-rounded fighter who benefits from both ATK and Burst damage? If the answer is yes, you've found a match. Equipping Akuoumaru on the right character is like giving a master chef a truffle—it elevates something already good into something sublime.

Here are the top-tier candidates for wielding this powerful claymore, categorized for your convenience:

🏆 S-Tier Picks (The Perfect Synergy)

• Beidou (4-Star Electro Sub-DPS): The absolute queen of Akuoumaru. Her entire kit revolves around her devastating Stormbreaker Elemental Burst. The weapon's passive turns her already powerful lightning discharges into a thunderstorm that would make Raiden Shogun nod in approval. It's a match made in heaven, or perhaps a very stormy sea.

• Eula (5-Star Cryo Main DPS): Eula's Glacial Illumination Burst is a nuclear option that scales with physical damage. Akuoumaru's Burst DMG bonus applies to the initial hit and the Lightfall Sword's explosion, making her final number even more absurdly high. It's like strapping a second, smaller bomb to a missile.

👍 Great Picks (Strong Contenders)

• Diluc (5-Star Pyro Main DPS): While he uses his Normal Attacks frequently, his Dawn Burst is a huge part of his damage rotation. Akuoumaru boosts both, making his fiery slashes and phoenix hit harder.

• Razor (4-Star Electro Main DPS): In his burst mode, his Normal Attacks are considered Burst damage. This quirky interaction means Akuoumaru's passive can boost his claw-swipe combos, making him hit like a wolf possessed.

🤝 Good Niche Picks

• Chongyun (4-Star Cryo Support/Sub-DPS): His Spirit Blade: Cloud-Parting Star Burst does massive, quick-hit Cryo damage. Akuoumaru amplifies this spike damage nicely.

• Xinyan (4-Star Pyro Support): If you're building her for a big, physical-damage Burst (her Riff Revolution), Akuoumaru can give that initial swing a significant boost.

In conclusion, Akuoumaru stands in 2026 as a testament to smart design over pure rarity. It rewards players who build their teams with energy synergy in mind, transforming collective potential into a single, earth-shattering strike. It may not have the glow of a 5-star, but in the right setup, it hits just as hard. Don't sleep on this weapon; it's the silent tide that lifts all damage boats. 🌊