How Issen works: confirmed basics

Quick answer

Issen and Break Issen are counterattack systems alongside Parry and Deflect. Use the live control menu for your selected input, then practice against one enemy type until you can distinguish the attack cue and timing window.

Verified answer

Regular Issen keeps the classic risk-reward: trigger it just before an incoming hit; failure exposes Musashi to heavy damage, while weaker enemies can be killed outright. Capcom has added location-based dynamic dismemberment to the result.

Player-useful details

For bosses, repeated Deflects drain a special gauge and enable Break Issen, which can destroy parts. The published PS5 demo controls identify Circle for perfect dodge and L1 for parry, but always follow the in-game layout on your platform.