It is a beautiful and -definitely- ambiguous description; ambiguous in a good way(according my criteria!). Like Pythia's words in the Oracle of Delphi. ;-)

"ethereal" always connects me to aither (with the meaning it had in Ancient Greece), the eternal, fiery, pneumatic power that holds earth, air, fire and water together and animates them.

Zeus asked Nyx how all things might be both one and divided, and he was bidden to wrap

aither round the world and tie up the bundle with the "golden cord".

The golden cord is itself ethereal and pervasive and holds all beings together until they die, come “unloosed,” and return to their source.

"Blind arrowheads". Hmm... This caught my attention!