get a repeating command block and type /summon ender_crystal and wait a few seconds and you get this 😈 (if you hit it you will go to height 44k and above lol) :
How to Get and Use Command Blocks in Minecraft - YouTube
Getting Started with Command Blocks | Microsoft Learn
TUTORIAL] Complete Guide To How To Delay Command Blocks (1.13 | 1.14 | 1.15 | 1.16)
What do the 3 different Command Blocks do in Minecraft 1.15? [Tutorial] - YouTube
repeating command block | Nova Skin
MCPE-42990] Command block minecart entity is still blue despite item being orange now - Jira
How to get Command blocks in Minecraft - 12Tails
Minecraft: Guide to using Command Blocks - Polygon
Repeating Command Block in Minecraft
I put a repeating command block summoning Ender Crystals in the End and this is the inside. I blew up the crystals and now I can't leave the end. I can go
Repeating Command Block VS Command Block Minecart! - YouTube
On peaceful mode, make a repeating command block spawn a wither and it will not move, nor dissapear(Works with any hostile mob) : r/Minecraft