Tameable Wither DataPack
This datapack adds the ability to tame Withers
To tame a Wither, place a Wither Rose next to it. Once tamed, you can ride the mob and control it in various ways.
Controlling a Tamed Wither
Mounting the Wither Sneak next to a tamed Wither and look straight up to climb onto it.
Movement Use the first inventory slot and right-click while looking in the desired direction to move the Wither.
Shooting skulls In the second slot, right-click to make the Wither launch destructive skulls, similar to its normal attack pattern.
Block-breaking dash Activate the destructive dash ability in the third slot, allowing the Wither to smash through obstacles - similar to the Bedrock Edition version.
Dismounting To get off the Wither, sneak, right-click and look straight down. If you dismount in mid-air, the Wither will slowly lower you to the ground.
Additional Materials
The included resource pack is optional - it makes the warped fungus on a stick invisible for more immersive gameplay.