Discovered on Transcended difficulty.

This glitch is repeatable and also accidentally discovered. Found that my health was randomly healing throughout the run. Finally figured out why by the end.

As far as I can tell. The way this works is due to a strange behaviour of Rapture since the last update. At the end of the finishing move animation, there are a few frames where you're still in the Rapture state. You can prove this by mashing attack fast enough and seeing a rapture attack being performed despite no longer "being" in Rapture.

If you trigger Saber pretty much as soon as you regain control after the animation, Rapture's Tier 3 passive healing is now permanent. It persists throughout the rest of the chapter. And even stacks with the passive healing of another rapture use. (2x the effect for every time you use Rapture for the rest of the chapter)

This is pretty much the perfect glitch to discover on Transcended difficulty. Because it certainly kept me alive.

As for allowing this in future runs. I guess we'll have to. It's a glitch that is tied to a core mechanic of combat. Accidentally triggering it is apparently rather simple. Because that's how I found it.