cercles

Cercles is a custom survival datapack for Minecraft 1.16.5 that adds a radiation zone mechanic to the game.

install the datapack, move it to saves - world - datapacks, enter the world where you placed it, and write /reload , /function #minecraft:load and /function radiation:load , to make the HUD work, use the following command: /summon armor_stand ~ ~ ~ {Invisible:1b,Marker:1b,NoGravity:1b,Tags:["rad_zone"]}

Features: 
- Create radioactive zones anywhere in the world
- Toggle radiation on and off
- Works without mods
- Multiplayer compatible

Commands:

Create a radioactive zone:
/summon armor_stand ~ ~ ~ {Invisible:1b,Marker:1b,NoGravity:1b,Tags:["rad_zone"]}

Remove all zones within 10 blocks:
/kill @e[type=armor_stand,tag=rad_zone,distance=..10]

Enable blowout:
/scoreboard players set #enabled rad_toggle 1

Disable blowout:
/scoreboard players set #enabled rad_toggle 0

to see the rack that gives off radiation, go to the observer mode