The Sharp Flame by ford_of_bruinen  

The Sharp Flame

he sudden flame spread quickly, unexpectedly, cutting through defences long grown lax with age. The blaze laid waste to the land and the scent of flesh burning clung to the air. The blackness poured from the iron gates, wrought if flames. The dark one had emptied his halls and cellars, throwing his creatures against us, snakes breathing fire, valarauka and those he had twisted beyond recognition.

The battle raged for days, fires laying waste to Dorthonion as defences, unprepared for such power and rage, shattered. Severed from kin they fought and died. The sharp flame fell in the roaring fires.