Put this schematic in any world and be aware that its setting world spawn so if you don't have /spawnpoint
somewhere else you will spawn on or below the contraption.
Please report bugs
To enable it, just click the button with a command block or type in /scoreboard players set "PLAYER" Ninja 1 or 0 for removing the ability
Ninjas won't get paralyzed
Ninja can't shoot arrows + no arrow of 3 blocks range will pass ninja
And other abilities are on sings in the schematic. Feel free to download