19 : Black Flash «Best Pick»

A dark, red, or electrical flash indicates success. Some versions provide a screen tint when it is primed, as explained in this TikTok video .

In Jujutsu Shenanigans , Black Flash is typically a high-skill combo finisher, often requiring precise timing or specific awakening states. 19 : Black Flash

As you deal damage, your "Focus" meter builds up. A dark, red, or electrical flash indicates success

Based on popular Roblox implementations like and Jujutsu Infinite , How to Use Black Flash (Jujutsu Shenanigans) As you deal damage, your "Focus" meter builds up

The key is to time your attack precisely at the end of a hit-stun on your opponent. How to Use Black Flash (Jujutsu Infinite)

You can often "chain" Black Flashes. After one lands, immediately re-engage with heavy attacks, as you may have a short window where another one is easier to pull off.

Some characters (like Yuji or Mahito) require you to be in a specific state—often activated by building up damage—before the Black Flash can occur.