So, what I and some friends gather from this chapter (which I like much more than Arianne's and which seems to hint towards many things):
CONFIRMED:
Euron indeed killed Balon. (And two other brothers)
Euron raped Urri and Aeron while they were children/young teens on regular basis.
HINTS:
The paradigm of the Drowned God is shifted. Through years, many theories leaned towards him being more aligned with Others than other gods due to all the Death aspect of the worship, but it seems implied in Aeron's vision that it is not so and that all so far introduced gods all stand on the same side when it comes to their relation towards the Others. I reason it to be so since the vision Aeron sees of a tall, pale woman with white fire around her hands next to the throne. Could those be visions of the Night King and his Other Queen? If so, Euron might be unwittingly gunning for that position and he is mistakenly believing that Dany should be at his side.
The armour of the Valyrian steel is certainly a revelation. Who will get it in the end?
Sphynxes are mentioned again in a sentence with krakens and dragons. Could this be a tie in with the sphynx being the riddle and not the riddler motif? Could sphynxes be another mythical creature which are the question that needs to be asked? What do they represent then? We know that they were a motif of the Old Valyria at least. Were they more than just a motif used in their art?
Euron certainly tries to be Valyrian: the dragons, his armour, enslaving everyone he comes across, etc.
Who is the Drowned God's champion? Aeron thinks it is not Asha nor Victarion. Who is left? Theon perhaps? Does this mean that all gods have their champions in this fight? Old Gods according to Mel have Bran. R'hlor has Snow according to Mel's visions even if she is unable to interpret them right. The Seven obviously have Davos unless he is actually Drowned God's champion. I mean, Jon seems to be R'hlor's even though he never believed in R'hlor. And if Davos might be the Drowned God's champion, who then is the champion for the Sevens? Or do they all share a champion/champions? A single individual chosen by more than one god?
A bit off topic, but I am starting to get the feeling that all these gods are seemingly on a similar power setting as Valar's and Maia in Tolkien mythology. Who is the Eru of this universe? XD