I have faced similar situation. His immortality triggered, the yellow glow was present but his attack was not unblockable. I think it was BWDO in the side quest who was just blocking him.
I have faced similar situation. His immortality triggered, the yellow glow was present but his attack was not unblockable. I think it was BWDO in the side quest who was just blocking him. Did you happen to trigger BWDO's evade? When she evades she inflicts a Sabotage debuff which would reduce your ability accuracy and could cause the Unblockable to fail.
I have faced similar situation. His immortality triggered, the yellow glow was present but his attack was not unblockable. I think it was BWDO in the side quest who was just blocking him. Did you happen to trigger BWDO's evade? When she evades she inflicts a Sabotage debuff which would reduce your ability accuracy and could cause the Unblockable to fail. Can it fail midway through? I did trigger her sabotage but Herc had already triggered immortality and got 5-6 combos into her through his unblockable. His invulnerability remained however, so it was weird.