Half A Heart Player

This addon gives you half a heart instead of the usual ten hearts. This definitely makes playing Minecraft a lot harder, as you die with the slightest bit of damage. You can use this addon for half-heart challenges, maps, playing with friends, and much more. And yes, this does work on servers, so you can also create half-heart servers by applying this addon.

You can also make Half Heart survival worlds and add spice to the challenge.