Onimusha: Way of the Sword Issen — Master the Critical Counter System
Updated 2026-06-03
Issen is Onimusha: Way of the Sword's premier combat mechanic—a frame-perfect parry that rewards precision with instant kills and massive soul bonuses. The Issen window is six frames (approximately 100 milliseconds) on standard Genma attacks, shrinking to four frames on elites and bosses. This guide breaks down the exact timing, drills to practice, and how to chain Issen against multiple enemies.
Frame data and timing
The Issen window begins six frames before the enemy attack connects. Visual cue: a white flash on the weapon or claw at frame 0 of the window. Audio cue: a metallic ring sound on successful parry. Holding the parry button instead of tapping does not register as an Issen—you must press and release quickly. Buffer input: pressing parry too early (7+ frames before hit) results in a normal block, not a parry. For more on combat fundamentals and Genma enemy types, see the dedicated guides.
| Enemy | Issen Window | Consequence of Miss |
|---|---|---|
| Genma Soldier | 6 frames | Block or hit taken |
| Genma Archer | 8 frames | Block or hit taken |
| Genma Knight | 4 frames | Guarded block, no punish |
| Elite Oni | 4 frames | Hit + stagger |
| Boss (Hideki) | 5 frames | Hit + knockback |
Chain Issen technique
Chain Issen lets you parry multiple enemies in quick succession. After a successful Issen kill, the parry window on the next Genma enemy remains active for about 500ms. To chain, rotate the camera toward the next attacker immediately after the kill animation starts—do not wait for the animation to finish. Each successful chain adds a combo multiplier to soul drops. See the full combat guide for advanced techniques.
- Start with one enemy: parry the third attack of their combo.
- Immediately rotate camera to the next enemy and press parry again.
- Chain bonus: +25% souls per additional chain kill.
Issen against bosses
Bosses have smaller Issen windows (typically 5 frames) but higher rewards. Each successful Issen on a boss deals heavy stagger damage, reducing their poise bar by approximately 25%. Four Issen counters on most bosses triggers a knockdown animation where you can unleash a full combo. Some boss attacks have a red glow—these are unparryable and must be dodged. Higher difficulties shrink Issen windows further, making practice on Normal essential.
FAQ
- Can I practice Issen outside of combat?
- The tutorial area has a practice dummy that cycles through attack animations for Issen practice. You can return to the tutorial via the main menu at any time.
- Does latency affect Issen timing online?
- The game is single-player with no online component. Lag is not a factor. Your TV's display lag can affect timing on console—enable Game Mode on your display for the most consistent parry window.