Core problem: in phase 3, Yoshitsune's health barely moves from normal sword hits. You only cut his HP while Oni Awakening is active. Everything else is stamina and soul farming so you can transform again. Die and you restart the whole three-phase fight.

1What to Do the Moment Phase 3 Starts

2Soul Drain: The Attack That Decides Runs

Awakened interrupt: the Onslaught interrupt on the Soul Drain draw is the fight's biggest single damage window and comes with a special animation.

3The Kill Loop (2-4 Awakenings)

Key Decisions

SituationRight Choice
Gauge full at phase startTransform immediately and hunt Issens. Saving it usually means eating a vacuum with nothing in the tank.
Vacuum starting, gauge emptySteal souls first. Only spend an Armament if you still cannot transform before the slash.
Stamina breakAlways purple souls, unless he is one hit from dead and you are already awakened.
Low on itemsCharm of Awakening or Stimulant replaces a dry gauge. Do not enter the phase empty if you can prep.

Prep Players Actually Credit

Common Mistakes to Avoid

If the health bar is not moving: you are not in Oni Awakening. Fix that first. The rest of the fight is the same duel you already learned in phase 2.

Video Walkthroughs

Soul Drain, gauntlet absorb, Awakening Onslaught interrupt, and the 2-4 transform pacing
Carnage-oriented run: purple breaks, vacuum absorb, Armament i-frames for the Onslaught window
Using leftover Awakening into phase 3 and timing the finisher as the gauge dies