Nobody has ever explained whether Euron's horn does what he says it does

Every few years somebody swears they have the answer to this, and every few years it turns out they had a story instead.

The question, put plainly: whether Euron's horn does what he says it does. My maester has a theory. My maester has fourteen theories.

There is a version of this where the truth is dull — a bad decision, a bad winter, nobody's grand design — and I have never once heard anybody argue for it.

Anyone who is certain about this has not thought about it long enough.