Helevorn was the deep, mountain-shaded lake in the cold lands northeast of Beleriand. Caranthir had his capital on its shores, but its waters were defiled by Glaurung during the Dagor Bragollach ("Battle of Sudden Flame"). It was destroyed in the War of Wrath along with Mount Rerir, though it partially survived.
Helvorn means "Black Glass" in Sindarin. It was probably translated from an earlier Khuzdul name such as "Narag-zâram".
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Index of Names", p. 158
- ↑ J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 37