I'm trying not to spend the rest of my life trapped between a Russian dictionary, a thesaurus and a rhyming dictionary, not to mention feeling rather guilty that r_blackcat did firmly say she didn't have time to translate the whole of Finrod Zong and yet has ended up heroically exploring... well.  Rather a lot of lines.

But I have to admit, I am pleased with what we finally wrangled into English between us, for Sauron's lines and then Finrod's great spell: I think it was worth the effort.

Sauron:

A feeble imitation of the Creator’s first design -

What little can you do, to restore the broken line?

The Song of Creation can no longer be altered:

The thread is too far woven, pattern forever faulted

I see you losing everything, all you have been given.

Left with only bitter memory... Are you strong enough for that?

Finrod:

Where nothing is forgotten,

there on the stone curl runes,

The strings of the lyre

untouched by running years.

At my shoulder stands the young

Untainted peaceful world

Rising like a new dawn

Nothing’s forgotten,

Memory has such power,

that it keeps us from harm.

Memory is alive

And see, she is unstained,

Wraiths and lies

vanish, like a dream.

That is the law

While imperishable light

fills the sky.

I call upon the memory of

the Light before Sun and Moon

To lift my voice against you.

So that our strengths are matched

...our strengths are matched...

Sauron:

Power in this world belongs only to he,

Who would without doubt tear off the chains of slavery

Quendi - naught but  servants of masters that they curse,

Pitiful  parody of the people who are real

Things like you can’t play the games of darkness and of light,

I am free to do with you, anything I want.