Possibly Maedhros?
The greatest treachery = the rebellion of the Noldor and the Oath of Fëanor
The middle part = pretty much summarizing the Sil
They = Valar, Host of Aman
"at that day, it all ends/ I'll die by my own hands" - Maedhros and Maglor steal the Silmarils, they are allowed to keep them and Maedhros dies "by his own hands" when casting himself to the chasm
...?
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Like the stars chase the sun, over the glowing hill I will conquer
Blood is running deep, some things never sleep Double Fenris
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