[Anguirel]

Here's the version the Silmarillion film project I used to work with came up with. Not written by me, I just did minor editing...it's a bit uncanonical, but interesting for comparison, I hope...

[Deafening cry from the crowd. Many of them draw their own swords]
Fëanor: War he shall have, and hatred undying! And we will defeat him! We will conquer! We will regain the Silmarils, and then we and we alone shall be lords of the unsullied Light, and masters of the bliss and beauty of Arda. No other race shall oust us!
[Caranthir leaps up onto the steps beside his father, sword flickering red]
Caranthir: Be he elf, or orc, or demon foul of Morgoth Bauglir…
[Celegorm and Curufin leap up to join him]
Caranthir, Celegorm, Curufin: Be he Mortal dark that in after days on Earth shall dwell…
[Amrod and Amras step up to join them]
Caranthir, Celegorm, Curufin, Amrod, Amras: Shall no law, nor love, nor league of swords…
[Maedhros steps up to join them]
Sons of Fëanor except Maglor: No might, nor mercy…
[Maglor joins in from the crowd]
Sons of Fëanor: Not moveless fate, defend him forever from the fierce vengeance of the Sons of Fëanor, whoso seize, or steal, or finding keep the fair enchanted globes of crystal whose glory dies not, the Silmarils. We have sworn forever!
Amrod: In Eru's name we swear!
Amras: The Everlasting Dark be upon us if we keep not our oath!
Caranthir: Manwë and Varda we name in witness, on their hallowed mountain of Taniquetil!
Sons of Fëanor: The Silmarils are ours until the end of Time!