The Heart of Heaven and the Imperial Earth
Okay. Yeah. Wow.
First thoughts: It's Lorkhan (The part about something being legend to the reader being fresh to him, the talk of being a "stepping stone", the warm way he speaks to man) sending a message too...mankind?
Forgive me if I sound accusatory, but now, in this final hour, my heart goes out to those droves of fevered refugees
Has a new meaning if so. White Gold Tower/Empire itself is a spaceship used to travel from planet to planet. Lorkhan's Heart is powering it? Explains the slave god in the earlier part. It makes sense, the only way to avoid the kalpa cycle is to escape Nirn itself.
The only real question is WTF are the Thalmor doing at the end? Interrupting a transmission between a planet-god and an abstract race.
EDIT: The other question being why send this message sometime in the Third Era, in the form of the Pocket Guide? Like, really? Obviously this series is about the meaning of the retcon and a concept of transcendence for Cyrods (spacetravel!) to match the Thalmor's unwinding and the Star-Wounded East's CHIM.
Which raises a third question. Direnni Tower is a spaceship. White-Gold is a spaceship. Red Tower is a
Star-Wound. Snow-Throat's Way of The Voice takes us closer to the sky than anything else. The Towers aren't keeping The World up, they are ways of escaping it. Ladders to the moon. Crystal-Like-Law was smashed by the Leaper-Demon, so now the Altmer need a new ride.
A Kirkbride-authored expansion to Skyrim set around a battle for Direnni Tower? All. Of. My. Money.