The show reflected the same actions as the book. You don’t “see” Euron killing his brother, but that’s what the show displayed. In the book, you “see” what Dragonbinder’s effects are, and in the show, you “see” the same effects but not the actual item.
My premise is Euron’s campaign speech in the show was so incredibly dumb (”I killed my bro! I’m your king!”), there’s no other rational explanation besides Dragonbinder’s usage to achieve that result.
As for Euron, his show geopolitical position is incredibly weak. The only prediction I can offer is history repeats itself.
Quote: “The show reflected the same actions as the book. You don’t “see” Euron killing his brother, but that’s what the show displayed. In the book, you “see” what Dragonbinder’s effects are, and in the show, you “see” the same effects but not the actual item.”
Umm, they showed Euron throwing his brother off the bridge. So yes, you do see it.