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Onimusha: Way of the Sword Build Guide: Every Oni Armament, Skill Tree, and What to Prioritise

All seven Oni Armaments ranked, the katana skill tree explained, and why your Oni Stones matter more than your Red Souls. The complete build guide for Onimusha: Way of the Sword.

Paul Allen·Reviewed by Paul Allen··5 min read·1,184 words
Onimusha: Way of the Sword Build Guide: Every Oni Armament, Skill Tree, and What to Prioritise

TL;DR

  • Musashi only carries one katana. Your build is entirely defined by which Oni Armaments you invest in and how you spend your Oni Stones, not weapon choice.
  • You cannot max everything in one playthrough. A single run gives 54 Power Stones and Oni Stones combined; the six gauge armaments alone want 33 Oni Stones, and the full Special Skills tree asks for 56.
  • Oni Stones, not Red Souls, are the real bottleneck. Spend them deliberately rather than on whatever's available first.
  • The Earth-Shakers are the strongest general-purpose Oni Armament for most of the campaign, breaking stamina and armor with hyper-armor through the swing.

Way of the Sword doesn't hand you a build menu and let you pick a class. Everything runs through one katana, seven Oni Armaments, and two separate currencies that don't refill fast enough to buy everything on a single playthrough. This guide covers what actually matters: where to spend, which Armaments earn their slot, and what to leave for New Game Plus. Companion piece to the full review if you haven't decided whether to buy it yet.

The Currency System, and Why Oni Stones Are the Real Bottleneck

Four resources drive every build decision, and they're not interchangeable:

ResourceWhat it doesWhere it goes
Yellow SoulsRestore health during combatSpent automatically, not a build resource
Red SoulsGeneral currencyOne upgrade node per Oni Armament, plus skill and enhancement costs
Power StonesSkill pointsThe Basic Skills tree (Reflex Combo, Chain Issen, Oni Bow line)
Oni StonesSkill pointsThe Special Skills tree (Oni Vision, Oni Armament upgrades)
A full playthrough gives you 54 combined Power Stones and Oni Stones. The six gauge-based Oni Armaments alone want 33 Oni Stones between them, and the full Special Skills tree asks for 56 on its own, more than a single run provides even before you've touched anything else. Red Souls are comparatively easy to farm through normal play. Oni Stones are the actual constraint on what your build can look like, and treating them that way from the start saves you from spreading them too thin and finishing the campaign without a genuinely completed anything.

The efficient early spend: Oni Vision: Treasures costs 2 Oni Stones and marks chests containing more Power Stones and Oni Stones, meaning it pays for itself. Grab this before committing stones anywhere else. A second tier, Oni Vision: Treasures 2, becomes available after the first Oni Portal for another 2 Oni Stones and extends the same effect. Oni Vision: Search Range is priced in Red Souls (5,500) rather than stones specifically so it never competes with your Armament budget, which makes it close to a free pickup once you've got the currency for it.

All Seven Oni Armaments, Ranked

ArmamentFoundBest for
Earth-ShakersUnderground lab, beneath Nijo CastleStrongest general pick. Shreds stamina and armor, hyper-armor through the swing
Wind-WhipperThe Oni Apprentice questlineCrowd control, wipes weaker Genma groups instantly
Two CelestialsKiyomizu-Dera TempleGenerates yellow souls, useful sustain option
Firebird FluteShadows Fall, sealing a riftSets enemies ablaze, damage over time
The Flashing VoidNear Mount Oe Castle entranceSingle devastating strike, good for closing distance on ranged enemies
Still WaterSide cave near Swamp 1 Mirror, ArashiyamaBuffs regular attacks instead of an instant burst, rewards sustained pressure and generates purple souls for Oni Awakening
(Seventh, situational)Story-gatedUtility-focused, less broadly useful than the six gauge Armaments above
Why Earth-Shakers wins by default: bosses shrug off raw health damage for most of the campaign, but stamina and armor breaks open the Break Issen window that actually ends fights. A full Oni Power gauge spent on the Earth-Shakers buys more practical value than the same gauge spent chasing health damage directly, and the hyper-armor on the swing means you won't get interrupted mid-attack, which matters against anything that punishes commitment.

Still Water is the deliberate exception worth knowing about. It's harder to use than the others because it doesn't give you an instant burst of damage, but if you can get consistent attack time on a boss, it's the best source of purple souls in the game, and purple souls are what fuels Oni Awakening. If you're building specifically toward Awakening-focused play, Still Water earns a slot the raw damage numbers don't fully show.

The Katana Skill Tree

You only carry one sword, so every point here compounds across the entire run rather than getting split across weapon choices. Three areas:

  • Attack power: raw damage scaling, the straightforward foundation of every build
  • Issen and Break Issen: the counter-strike system itself. Upgrades here expand your Issen windows, sharpen the timing forgiveness, and unlock the more powerful Break Issen tier. This is the actual skill ceiling of the katana, and where a serious build should be spending early points
  • Armament stats: improvements that carry over into your Oni Armaments, meaning katana investment isn't a separate track from your Armament build, it directly feeds it
Stance switching between one-handed and two-handed grip doesn't cost your Oni Power gauge and doesn't slow time, unlike swapping Armaments. Many players default to one-handed for safety and leave real damage on the table doing it. Make stance a genuine read-and-react choice rather than a habit, since it costs nothing to switch.

The Earth-Shakers generalist. Front-load Oni Vision: Treasures for the stone economy, then commit early Oni Stones to Earth-Shakers upgrades and Issen/Break Issen katana skills. This is the safest, most broadly capable build across the whole campaign, and the one most reviewers describe as the default strong option.

The Awakening build. Prioritise Still Water for purple soul generation, invest Power Stones into Basic Skills that support sustained engagement rather than burst damage, and treat Oni Awakening as your actual damage cooldown rather than a rare event. Riskier to play well since Still Water demands attack uptime most boss fights don't freely give you, but genuinely strong once you've got the timing down.

The crowd-control build. Wind-Whipper as your primary Armament, paired with Oni Bow skills from the Basic tree for ranged options against archers and groups. Weaker against single tough bosses than the Earth-Shakers path, but a real quality-of-life pick if you're finding standard Genma encounters more tedious than threatening.

Skills Worth Buying Early Regardless of Build

  • Oni Vision: Treasures (2 Oni Stones): pays for itself, buy first
  • Assassination: unlocks stealth kills from behind, useful across every build and tied to the Silent Violence trophy
  • Oni Bow skills (charge speed, headshot handling, arrow capacity): makes side content noticeably less tedious even outside a dedicated ranged build

What to Leave for New Game Plus

Given the stone math doesn't let you finish everything in one run, the sensible default is committing fully to one Oni Armament and the Issen/Break Issen katana line first, then carrying whatever's unspent into New Game Plus rather than spreading thin across every Armament at once. Everything you didn't buy carries over, so NG+ genuinely completes an unfinished build instead of just resetting the difficulty, which makes a focused first run the efficient choice rather than a limitation to work around.

Where to Go Next

Onimusha: Way of the Sword is available now on PC, PS5, Xbox Series X/S, and Nintendo Switch 2. $69.99.