Quick Scoop: In Jujutsu Infinite , Black Flash is usually done by landing a heavy attack right as the Black Flash prompt appears after you’ve unlocked the needed Focus progression. The common setup is unlock the Focus Wake node , build Focus Tokens by fighting, then use right click / heavy attack when the prompt shows; some guides also note you need Shift Lock on.

How to do it

  1. Unlock Black Flash in the Focus skill tree. One guide says the prerequisite is the Focus Wake node, which gives you three Focus Tokens.
  1. Build Focus Tokens by dealing damage. Those tokens fill up as you keep fighting.
  1. Get the Black Flash prompt, then hit heavy attack fast. The guides describe using RMB / M2 to bring up the prompt, then pressing R or your heavy attack input before the prompt disappears.
  1. Use it on highlighted moves when available. Some sources say certain abilities show as highlighted in red and can be cast as Black Flash variants.

Extra notes

  • One video guide says Black Flash tokens can also be used toward Maximum Techniques and related awakenings.
  • Another guide says Shift Lock may be required for the input to work properly.

Fastest practical tip

If you want the simplest version: unlock the Focus node, build tokens in combat, turn on Shift Lock, then press the heavy attack as soon as the Black Flash prompt appears.

If you want, I can also give you a super short button-by-button version or a build/tree guide for unlocking it faster.