"The Soul Room" AKA Eldunar

"The Soul Room" AKA Eldunar is A very special room that serves as the central nervous system or heart of the entire Facility.

Function
''"the Eldunari connects the mind of the Caretaker to the soul of the Warehouse". '' -Retracted

The Eldunari is filled with floating symbols (mostly ancient Equestian runes) constanly moving in all directions.

If the symbols are moving in perfect harmony then that's a sign the Facility is happy and healthy.