Okay I did the thing with the Stone Layers, but oh gawd why is there loud Boss Music in the final Dimension, which never stops (I never found the Boss it came from) and is not even adjustable by anything but the Master Volume…
Did you know what the “Universal Chest” does? It stores Items like an Enderchest but across Savegames. I noticed that when I found its Data in the Config directory of all places.