Dragonbinder, called the hellhorn, is a monstrous black warhorn six feet long, banded in red gold and dark Valyrian steel and graven with glyphs that glow like embers when it is winded. Euron Greyjoy claims to have taken it from the smoking ruins of Valyria, and swears that it will bind any dragon that hears its call to the will of the one who blows it. He gave it to his brother Victarion to carry east across the world to Daenerys Targaryen.
The horn is bound in sorcery and bale. The thrall who first sounded it before the captains of the Iron Fleet died with his chest scorched black and his lungs cooked within him, and the glyphs warn — so the maesters read them — that no mortal man may blow it and live; the price of its music is paid in blood.
Status: extant, borne east aboard Victarion's flagship.