Oni Armaments are the signature super moves of Onimusha: Way of the Sword. Channeling blue souls through the Oni Gauntlet, Musashi summons legendary demon-forged weapons that devastate everything in their path. Each armament has a unique playstyle, upgrade path, and ideal use case. This guide covers every armament in the game, how to unlock them, and when to use each one for maximum effect.
How Oni Armaments Work
Before we get into individual armaments, let us cover the mechanics that apply to all of them:
- Blue souls fuel the system. Every armament activation consumes a portion of your Oni Power gauge, which is filled by absorbing blue soul orbs.
- Activation is instant. You can summon an armament at any point — even mid-combo — and it immediately replaces your katana.
- Duration varies. Some armaments last for a fixed duration, others consume power per hit, and one is a single massive attack.
- They are upgradeable. Each armament has three upgrade levels that increase damage, duration, or add new effects.
- Switching costs power. You can swap between armaments mid-fight, but each swap consumes additional Oni Power.
Blue souls are the rarest resource in the game. You cannot farm them efficiently — you get what the game gives you. Wasting Oni Power on trivial fights means you will not have it when you need it for bosses or tough encounters. Be selective about when you activate an armament.
Armament #1: Oni Katana — The Balanced Option
The Oni Katana is the first armament you unlock, and it remains a solid choice throughout the game. It is essentially your katana turned up to eleven — faster strikes, more damage, and a wider hitbox, all wrapped in a flaming demonic blade.
Stats & Upgrade Path
| Level | Damage | Duration | Special Effect |
|---|---|---|---|
| Base | 1.5x katana damage | 20 seconds | Fire damage on every hit |
| Level 2 | 1.8x katana damage | 25 seconds | Fire damage + burn DoT |
| Level 3 | 2.2x katana damage | 30 seconds | Full combo chains instantly |
When to Use It
The Oni Katana is your general-purpose armament. Use it when:
- You are fighting multiple enemies at once and need sustained damage
- A boss is staggered and you want to maximize punishment time
- You need to clear an arena quickly but do not know what is coming next
It is not the flashiest armament, and it is not the best at any one thing. But it is always good, and you will never regret upgrading it. The Oni Katana is the safety net of the armament system — if you are not sure what to use, this is a fine choice.
Armament #2: Oni Spear — The Ranged Option
The Oni Spear is a long-reach piercing weapon that excels at hitting enemies from a distance and punching through groups. It is the armament of choice for players who prefer to control range and pick their engagements carefully.
Unique Mechanics
- Long reach. The spear hits enemies well outside normal melee range.
- Piercing attacks. Thrusts go through multiple enemies in a line.
- Throw attack. You can hurl the spear for massive damage — but it ends the armament early.
- Counter stance. Hold guard with the spear and it charges a counter-thrust that deals extra damage.
When to Use It
The Oni Spear shines in specific situations:
- Long narrow corridors. Enemies come at you single file? Spear them all in one thrust.
- Flying enemies. The spear's upward thrust reaches much higher than the katana.
- Bosses with long-reach attacks. Out-ranging a boss is a legitimate strategy with the spear.
- Crowd control. The knockback on spear attacks keeps enemies at a safe distance.
The spear throw is one of the highest single-hit damage sources in the game. If you know exactly when a boss is about to be staggered, save the spear and throw it into the opening for massive burst damage. Just make sure it connects — if it whiffs, you have wasted the entire armament.
Armament #3: Oni Gauntlet — The Brawler
The Oni Gauntlet transforms your off-hand into a massive demon fist for close-range brawling. Fast, aggressive, and absolutely brutal when you get in close, the gauntlet is the armament for players who like to be in the enemy's face.
Playstyle
The gauntlet works differently from other armaments. Instead of replacing your weapon, it adds an off-hand fist that you use in combination with your katana. You now have two attack buttons — one for the sword, one for the fist — and mixing them creates devastating combos.
- Punch combos are fast and build stagger quickly
- Katana finishers deal massive damage to staggered enemies
- Parry counter-punch — parrying with the gauntlet equipped triggers an automatic counter punch
- Ground slam — hold heavy attack for a shockwave that knocks down groups
When to Use It
The gauntlet is at its best when:
- You are fighting a single tough enemy and can focus on close-range pressure
- You need to build stagger fast to open up a boss for a finisher
- Enemies are constantly in your face and you want to fight fire with fire
- You want the highest possible damage per second in the game
Armament #4: Oni Bow — The Sniper
The Oni Bow is the ranged armament, turning the game briefly into a third-person shooter. Powerful charged shots, explosive arrows, and the ability to hit enemies from across the arena make it a versatile tool in the right hands.
Arrow Types
| Arrow Type | Effect | Best Used On |
|---|---|---|
| Standard | High damage single target | Elite enemies, weak points |
| Explosive | Area-of-effect explosion | Groups of enemies, clustered adds |
| Piercing | Goes through multiple enemies | Enemies in a line, tight formations |
| Soul Arrow | Generates souls on hit | Groups — turn enemies into soul factories |
When to Use It
- Arena encounters with many enemies. Rain explosive arrows from a safe position.
- Bosses with visible weak points. Charge a shot and nail the weak spot for massive damage.
- Flying enemies that are hard to reach. The bow is your answer to aerial threats.
- When you need breathing room. Use the bow to create distance and assess the situation.
The Oni Bow is terrible at close range. If an enemy gets in your face while you have the bow equipped, you are in trouble. Always keep a dodge roll available to create distance, or switch back to the katana if things get too close. The bow is a tool — not a primary weapon.
Armament #5: Ultimate Oni Form
The Ultimate Oni Form is the final armament, unlocked late in the game. It is not so much a weapon as a complete transformation — Musashi is fully consumed by demon power, becoming a towering Oni warrior with devastating attacks.
Ultimate Form Abilities
- Massive damage increase. Every attack deals roughly triple katana damage.
- Invulnerability frames. You take reduced damage for the duration of the transformation.
- Double jump and air dash. New movement options let you reposition anywhere in the arena.
- Ultimate finisher. A screen-clearing attack that consumes the rest of your Oni Power.
When to Use It
The Ultimate Oni Form is your "oh no" button. Save it for:
- Boss phase transitions where you need to burst down a health bar fast
- Arena encounters where you are overwhelmed and need a reset
- Any situation where you are at low health and need to turn the fight around
It is the most powerful ability in the game, but it also consumes the most Oni Power. Use it wisely — a well-timed Ultimate Form can win an impossible fight, but wasting it on trivial enemies is a mistake you will regret later.
Which Armaments Should You Upgrade?
You cannot fully upgrade every armament on your first playthrough — there are not enough upgrade materials. Prioritize based on your playstyle:
- Aggressive melee players: Gauntlet → Katana → Spear
- Ranged / methodical players: Bow → Spear → Katana
- Everyone: Max the Ultimate Form last — it is powerful but you use it the least
Oni Armaments are the power fantasy at the heart of Onimusha. They are the moments where you stop defending and start dominating — where Musashi stops surviving and starts destroying. Master each one, know when to use them, and the demons of Kyoto will fall before you.