Nether Start/Wither Challenge
A simple datapack that lets you start your Minecraft world in the Nether! Also has an optional Wither challenge variant.
Quick challenge
How far can you run before the mobs catch you?
Minecraft check
Confirm your run
Complete the quick check to get your code.
Nether Start/Wither Challenge
This is a datapack based on this video by Bosmic.
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A NEW WAY TO START
Have you ever felt like the default survival start is too easy? This datapack allows you to spawn in the Nether instead of the Overworld to provide a more difficult start to your journey. > 
THE WITHER CHALLENGE
If you're looking for an even harder challenge, select the Wither Challenge variant of the pack when downloading. It will lock you in the Nether until you have successfully summoned and defeated the Wither. > 
GOOD LUCK!
If you choose to play in Hardcore mode, you'll probably be resetting a lot so I'd recommend using the mod version over the data pack version as it will automatically load the pack on every world.