I am building a map and I need a command that detects when a player (preferably in a certain team) has an effect. The effect I will be detecting is STRENGTH 255. I already tried this command: /execute if entity @a[nbt={ActiveEffects:[{Id:5b, Amplifier: 255b}]}], and ran a comparator off of it, but it didn't seem to work. I also set the command block to repeat and always active. All feedback is appreciated.

1 Answer 1


Why Doesn’t it Work

Minecraft Java ActiveEffects tag is written as a byte, and values over 127 will wrap around to -127. This means that level 128 is actually -127. 255 is actually -1.


Try this:

/execute if entity @a[nbt={ActiveEffects:[{Id:5b, Amplifier: -1b}]}]
  • 1
    Let’s just pretend I am smart and didn’t forget about that... you saw nothing
    – Penguin
    Oct 18, 2020 at 3:56

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