Simple data pack that adds a new game mechanic - lava will give you a "regeneration" effect!
You can install it for Minecraft 1.20 and up. If someone don't know how to install this data pack, read this:

How to install:

• Download data pack
• Launch minecraft
• Click "Create new world"
• Click "More" and select "data packs"
• Drag .zip archive into "data packs" page
• Enjoy :)

How to install on server:

• Download data pack
• Open your server page (Aternos, ScalaCube etc.)
• Open 'files' page
• Open world > datapacks folder
• Drag downloaded data pack into this folder
• Start the server and enjoy :)