Ultra hard core is a PVP centric version of minecraft. you can think of this like Fortnight or PUBG but for minecraft. The original UHC was made for Java edtion, but most Minecraft players play on minecraft bedrock. This pack is for the bedrock players.
Some notes Game test is experimental. There are changes coming every update at this point that often break this pack. I may not get to fixing those changes right away. i know it is frustrating, but that is the price of using new tools.