JJK BlackFlash Addon
by Deela
JJK BlackFlash Addon is a Forge add-on for JujutsuCraft that makes attacks trigger a Black Flash effect with increased damage, and it runs on the server alone.
What it does
The add-on builds on the JujutsuCraft mod, which must be installed alongside it on Minecraft Forge 1.20.1. Whenever an attack hits an entity, a Black Flash visual effect plays and the hit deals increased damage by default. The timing window that simulates a confirmed Black Flash is set to 2.5 and can be changed in the config, and the intensity of the effect and the amount of particles are configurable as well.
Summons are part of the mechanic too: tamed Shikigami and summoned Cursed Spirits can trigger a Black Flash of their own. The Zone effect is applied automatically when a Black Flash lands, and it clears fatigue, so a player can keep fighting. Only the server needs the mod, so players join without installing it, though they still need JujutsuCraft to play.
The project is described by its author as an unofficial add-on for JujutsuCraft. It is released under the Apache License 2.0 and is not open source. Forge files exist for 1.20.1 only, with version 1.4 as the latest file, published on 2026-02-23.
Key features
Black Flash on hit
Each attack that hits an entity triggers a Black Flash visual effect and deals increased damage by default.
Confirmed-hit timing
A 2.5 timing window simulates a confirmed Black Flash, and the value can be adjusted in the config.
Shikigami and Cursed Spirits
Tamed Shikigami and summoned Cursed Spirits can also trigger Black Flash, extending the effect beyond the player.
Adjustable effects
Effect intensity and the amount of Black Flash particles can be configured to suit the server's visual preferences.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners running JujutsuCraft who want Black Flash hits and Zone effects in their combat. Players who only join those servers need JujutsuCraft but not this add-on.
How it compares
JujutsuFIN is a Forge mod for 1.20.1 that runs on client and server and is released under All rights reserved, so both sides need it. Jujutsu Kaisen: Character Randomizer is also Forge-only for 1.20.1, requires both sides, and is under All rights reserved. HyperKaisen is Forge for 1.20.1 as well, runs on client and server, and is licensed under Creative Commons Attribution 4.0. This add-on differs by running on the server alone under the Apache License 2.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JJK BlackFlash Addon | Forge | 1.20.1 | Server-side only | 2026-02-23 |
| JujutsuFIN | Forge | 1.20.1 | Client and server | 2026-08-02 |
| Jujutsu Kaisen: Character Randomizer | Forge | 1.20.1 | Client and server | 2026-03-27 |
| HyperKaisen | Forge | 1.20.1 | Client and server | 2026-05-12 |
Questions
Does JJK BlackFlash Addon require JujutsuCraft?
Do players need to install JJK BlackFlash Addon?
Can the Black Flash timing be changed?
In the catalog
JJK BlackFlash Addon is one of 7,216 Magic mods on ModsFinder, and one of 3,927 Magic mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from Deela
Similar mods
What the author says
Whenever you hit an entity, it will trigger the Black Flash visual effect and deal increased damage (default ×2.5, configurable), simulating a confirmed Black Flash every time. It also automatically applies the Zone effect and clears fatigue. New in v1.2.1: - Summons Support: Your tamed Shikigami and summoned Cursed…
Official listing
- Modrinth page
- modrinth.com/mod/jjk-blackflash-addon
- Owner
- Deela
- Published
- 2026-02-03
- Updated on Modrinth
- 2026-02-23
- Facts verified
- 2026-10-15