What's with the small bedrock room down low to the south west of the sphere?
Also, will I hit any game-breaking issues if an Ender Quarry digs through it?
(Not the Melon-Travel anchor room, the other one with no means of entry that I've seen)
It contains a resonant strongbox with all the spatial areas. and also I command block which levels up whatever tinker tool is equipped in your hand. I would recommend breaking in using the dark oak sapling trick, ender quarry might not give you the commend block and might remove the code.
there is also a TiCon crafting station