Balrog doesn’t originate from the Udun nearby Morannon. When Gandalf calls it ”The Flame of Udun”, he means Utumno, the First Realm of Morgoth. Udun is a Sindarin form of that name. It is very likely that Sauron had named the later Udun after Utumno.
Annúminas was the first capital of Arnor though, but it fell into ruin due to losses in the war against Sauron. Afterwards the capital was moved to Fornost.
Annúminas was the first capital of Arnor though, but it fell into ruin due to losses in the war against Sauron. Afterwards the capital was moved to Fornost.