Now that we understand what the beast tribes and...someone... is summoning "spoilery"

[Gilraen]

I am not a lore master, so I can't discuss with that; but thanks for that, I didn't understand well how worked our relation with Hydaelyn
I just wanted to say that nothing is "too absurd" in a fantasy game

I'm no lore aficionado either, this is all just stuff I've picked up from playing the game. It's not really trying to hide anything, either. The Ascians teach the sahuagin how to invoke the Echo, and they're about as connected to Hydaelyn as the Ascians themselves. It's amazing what you learn when you don't skip all the cutscenes.