Most of it comes from EE, but there hasn't been anything in the game that I'm aware of that has contradicted it and the Crystal Tower as a sun-collecting device is mentioned multiple times as well. Plus, if the Crystal Tower soaked up aether in Silvertear Falls, why is it still the most aether-rich place in the world and not an aether desert like the Burn?
The focus of the empire now shifted from expanding its borders to bettering the lives of those who lived within them. One such undertaking involved the construction of a massive array of spires at Silvertear Falls designed to gather the very rays of the sun and deliver that energy to the homes and manufactories of the empire. With the completion of the Syrcus Tower - or the Crystal Tower, as it would come to be called in the scripture of later eras - the Allagans began their reliance on myriad machina to ease their daily burden and allow them to concentrate on bettering their minds and their souls. For three centuries, not a war was waged on the Three Great Continents, and the bloodshed which had spawned the empire became but a blemish on a forgotten age.Doga and Unei mention it outside of the EE:Utilizing the solar energies collected in the Crystal Tower combined with his newly perfected vivification techniques, Amon achieved the impossible. Xande walked Eorzea once again.
Originally Posted by Unei
And in the quest itself there is clickable lore dump somewhere that's now available as a Rammbroes dialogue option:Originally Posted by Doga
Originally Posted by NOAH Report - Syrcus Tower
G'raha Tia then mentions it again in Shadowbringers as he's killing Elidibus:Originally Posted by Sightseeing Log
Originally Posted by Crystal Exarch
As for the Allagan Empire being from Eorzea, that's also in the EE:
As Xande learned more of magic’s potential, he assigned many of these ‘mages’ to his newly formed army, where their unmatched strength on the battlefield allowed the young leader to subjugate neighboring lands with limited Allagan casualties. In less than a year, Allag was the largest nation in Eorzea and Xande crowned himself emperor.Xande knew he would not live forever, but was not about to allow his life’s work come to naught upon his passing, so he carefully groomed his offspring to carry on his legacy. As a result, in the years subsequent to the first emperor’s death, the direct descendants of Xande fostered the growth of the empire by dispatching its armies to the far corners of Ilsabard and Othard. While there was resistance, the empire made short work of all who stood before it, and in time there was not a city in the Three Great Continents where the imperial standard did not hang.



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