Addon to hexcasting on 1.20.1 that adds rooms (all information here is for the 1.3.0+ versions which will be uploaded when I get home)
adds a new pocket dimension called a room. (default max size is 100x50x100, configurable) rooms can be carved via a new great spell. (one block per tick, configurable) and a ton of new enlightenment-requiring spells to work with rooms. you can pass rooms around and even remove permissions from a room (RWX) Read lets players use the room iota to enter the room Write lets you remove permissions on a room iota (and soon delete rooms) Execute lets you use Everett's Environemnt to cast with full ambit in a room.
the hexdim comes with a shader which gets disabled if sodium exists
if you want to manually disable the shader (for performance reasons)
add -Dhexdim.disableShader=true
to launch arguments for your perfered launcher