With Euron you definitely feel that there's something supernatural going on, the vision that Damphair has, of Euron sitting on the Iron throne with all the Gods impaled on it, has some deep meaning. Maybe Euron really wants to kill all the gods, maybe he want to become god himself.
Then there's the fact that Damphair is attached to the prow, and he's tasting salt on his lips, which to me sounds like he's drowning. So maybe this is a sacrifice, and it's all part of a magical ritual.
I wonder how useful a Valyrian steel armor is, I don't think it's as useful as a sword for example, but it's covered in runes so it's likely more magical too. I love the imagery of Euron, he's wearing black and red which traditionally are the colors of the Targaryens.Maybe he's preparing himself for the marriage with Dany.
Speaking of Dany I can't help but feel that she saw Euron in one of the House of Undying visions, the bit about the guy with blue lips. I'm even more convinced of it now.
Yep Euron really is the maddest of them all, but perhaps there is some truth about his character. He seems to be aware of the supernatural side of things, or maybe he just consumed too much shade of the evening lol.