Onimusha Issen Guide

Last verified: Sep 10, 2026

Issen is the signature technique of Onimusha: Way of the Sword — attack at the precise moment an enemy attacks and you answer their blow with one of Musashi's strongest strikes. It is the highest-risk, highest-reward tool in the game, and this guide breaks down exactly how the timing works and how to practise it.

What Is Issen?

Issen is a precision counter: attack at the moment an enemy attacks to turn a read into a decisive strike. In practice, you begin an attack right as the enemy's blow is about to land — not during their wind-up and not after the hit. Get the timing right and Musashi slips to the side and delivers one of his strongest strikes. The window is smaller than a normal parry — react to the attack itself, not the wind-up.

It is deliberately harder than a parry. A parry window is generous enough to catch most strikes; Issen demands the last possible moment, which is why the game teaches parry and Deflect first. The payoff matches the risk: Issen deals far more damage, and it does not require an enemy's stamina to be drained first.

Deflect is a separate defensive action, not a softer Issen. On the default Defense layout, hold Block and press the secondary input as the attack lands — L1 + X on PS5, Block + A on Xbox. Unlike a parry, it does not open the enemy in the same way; its main payoff is heavy Stamina damage, and it can also return compatible projectiles. In Blazing State, Deflects drain even more Stamina.

How to Trigger Issen

The input is simple: press the attack button so that your strike lands in the instant before the enemy's attack connects. Practically, that means ignoring the enemy's wind-up animation and reacting to the attack itself — the moment the blow is committed and coming toward you.

• Do not mash. Each attempt should be a single, deliberate attack press. Mashing reads as a normal combo, not an Issen attempt.
• Watch one enemy at a time. Issen timing is learned per attack animation. Pick a single readable enemy and drill that one attack until it is instinct before moving on.
• Do not force it in crowds. Surrounded by Genma, the window gets buried under other animations. Use Issen on the enemy you are actively reading, not on chaos.

Chain Issen

Land one Issen and the game lets you chain the momentum. Chain Issen lets you follow a successful counter into additional Issen attempts against nearby enemies — the trophy "Flow State" requires defeating 50 enemies with Chain Issen attacks. In practice, after a successful Issen the window re-opens briefly, so a cluster of enemies becomes a sequence of counters rather than a single one. Chaining is where Issen stops being a defensive tool and becomes the fastest way to clear a room.

Break Issen

Break Issen is a separate, prompted finisher that becomes available once an enemy's Stamina Gauge is completely depleted — the game tells you it is ready, but you still have to attack, and against strong enemies you choose a target area. Red-marked target areas deal massive direct damage or break a relevant body part; purple-marked areas release a large quantity of souls (yellow health, blue Oni Power and purple Awakening).

Break Issen instantly kills most lesser Genma and deals severe damage to bosses, making it the anchor of boss fights: Deflect to drain Stamina, then cash in with Break Issen when the prompt appears. Timing-based Issen still earns its place in between — a successful counter also deals heavy health and Stamina damage. Blazing State strengthens the whole loop: Deflects drain more Stamina and Break Issen consumes more boss HP.

Using Issen Against Bosses

Most committed strikes can be answered with Issen, with two exceptions. White-glowing attacks cannot be countered with an Issen at all — they must be met with a Parry or a Deflect. Blue-highlighted specials, such as kicks, rushes and grabs, call for a dodge or grab reversal timed just before contact rather than an Issen. Boss fights are then a matter of patience: learn each attack's timing, Issen the readable ones, Parry or Deflect the white glow, dodge or reverse the rest. The more counters you land, the better the absorbable souls on offer, which feeds the whole Oni economy.

A few boss-specific notes:

• Byakue: his axe swings are mostly deflectable and Issen-able, but shoulder charges and sprinting charges cannot be Issen — dodge them. The Leaping Axe Strike is one of the clearest Issen windows in the game and hits both HP and Stamina. His hair-grab is a blue-light grab: press Circle just before contact to reverse it.
• Enhanced Byakue: below half HP his axe becomes coated in Malice — jump the ground slam at its impact and stay out of the Malice pools it leaves behind.
• Sasaki Ganryu (first duel): parry his strikes to build the Issen prompt, then land the counter on the red target for phase two.
• Daidara: his swings are slow and readable — ideal Issen practice once you learn the rhythm; dodge his kick and heavy slam instead.
• Dohatsu-ten: in his enhanced state his white-glowing teleport attacks can only be parried or deflected, not Issen'd.
• Greater Nue: the white-glowing tail sweep is a Parry or Deflect check, not an Issen opening.
• Benkei: the white-glowing combo from his second polearm must be parried or deflected rather than Issen'd.

Full per-boss strategy is in our boss guide.

Issen & the Oni Awakening Combo

Issen becomes dramatically easier to land while Musashi is in his Oni Awakened state — the transformation is the game's way of rewarding aggressive counter-play. When the Awakening gauge is full, resist the urge to fire the devastating finisher immediately. Instead, chain Issen counters while the state lasts, and save the finisher for when the meter is nearly empty. A full Awakening used this way converts one transformation into several guaranteed counters plus the finisher — far more damage than pressing the finisher at the start.

Blazing State helps the same loop indirectly: its increased damage and blue-soul rate feed the Armaments, which generate the purple souls that fill the Awakening gauge. Defence → Blazing → Armaments → Awakening → Issen chain is the game's deepest combat expression.

Practice Drills

If Issen is not clicking, work through these drills in order:

1. The single strike. Fight one sword-wielding Genma with no combos. Press attack only when its strike is committed. Success is one clean counter, not a win.
2. No guard. Remove blocking from the fight entirely. You may only dodge or Issen. This forces the read instead of the panic-block.
3. The parry bridge. Parry an attack, then immediately attack — the parry stun teaches you the spacing where your strike lands first.
4. Boss application. Take the read into the Byakue or Ganryu fight, where attacks are loud and committed.

Issen FAQ