I thought for a moment they were complaining that Jews had horns, not used them. Because I hear "goblin horns" and just think "horned goblins". And I was just trying to figure out what kind of advanced antisemitism was involved in making a game lore element be chopping off Jews' horns, when I realized they meant a trumpet.

Every society with any level of advancement has used horns/whistles to signal with sound. It's hardly unique to any one. Maybe the Norsemen from north Netherlands would like to weigh in, they used horns before Judaism was even a thing.