FIN -> ENG Pedon Loitsu by Kivimetsän Druidi

Hi! Could you please check and correct my translation of this song and translate the parts I don't understand? Thanks a lot in advance

Pedon loitsu

Se mielen valtaa
Ei armoa anna
Ei heikkoja valikoi
Se mielen valtaa
Silloin toivonsa rippeet joka ainoa menettää
Uni mielen tuskaisan
Kuva kaikken pahimman
Kivun rintaan nostaa
Veri suonissa kuohahtaa
Loitsu pedon suurimman
Unimielen valtaajan
Vihan ylleen kasvattaa
Vie rauhan muassaan
Se mielen valtaa
Ei armoa anna
Ei heikkoja valikoi
Se mielen valtaa
Silloin toivonsa rippeet joka ainoa menettää
Tuon pedon loitsun mahtavan
Niin moni, niin moni tuntea saa tuskaisan
Synkkä ja pimeä on mieli pedon uhrin
Se vihassa kylpee ja tuskasta juopuu, niin on sen valta suurin
Tuon pedon loitsun mahtavan
Niin moni, niin moni tuntea saa tuskaisan
Unelmaa
Et yhtä ainoaa
Et muistoa kaunimpaa
Mitään et pitää saa
Vain surua ja tuskaa
Epätoivoa valtavaa
Mieli onneton halajaa
Vaan kauaa ei kestä tuo vihan valta
Ei ikuisuuksiin se kanna
Kuinka kauan voi pahuus johtaa
Kuinka kauan voi pelon armoilla mieli vaeltaa
Ei ilman toivo voi johtaa
Ei silloin valta kestää saa
Ilman armoa valtiaat vie kansansa kapinaan
Kääntyy kansa petoa vastaan
Ja niin, ja niin tuo pahuus voitetaan
Vaan niin kääntyi taika tuo, vastaan loitsuaa pahinta
Ja niin taas unelmat nuo, vapaana lentää saa


The spell of the beast

That power of mind
Doesn’t give mercy
Doesn’t choose weak
That power of mind
(?)
A dream of pained mind
A picture of everything worst
Pain in your chest increases
Blood boils in your veins
The largest spell of the beast
(?)
The hatred above grows
Takes away peace with it
That power of mind
Doesn’t give mercy
Doesn’t choose weak
That power of mind
(?)
Of that mighty spell of the beast
So many, so many got to feel pain
Gloomy and dark is the mind of a victim of the beast
It’s bathed in hatred and drunk from pain, so big is its might
Of that mighty spell of the beast
So many, so many got to feel pain
A dream
Not a single one
No memory of beauty
(?)
Only sadness and pain
Enormous despair
Unhappy mind desires
But that power of wrath will not last for a long time
It doesn’t carry on eternally
How long can evil rule
(?)
Not without hope it can rule
Not then the power can last (?)
Without mercy rulers will lead their nation to rebellion
Turn people against the beast
And so, and so that evil is defeated
(?) against the worst spell
And so these dreams again can be free to fly

You've done pretty well! I'm impressed how far you've managed to translate by yourself. It must've been challenging to figure out what those phrases mean. I mean, it's sometimes hard for a genuine Finn to understand song lyrics, too! Especially when they include rare idioms, slang words or poetic/bad grammar (all of which, btw, could be found in this song also!).
Anyways, here's the (mostly) correct translation that I did

The Spell of the Beast

It claims the mind
Doesn't give mercy
Doesn't choose weak ones
It claims the mind
That's when every single one will lose their last scraps of hope
A dream of pained mind
A picture of the worst of all
Brings up pain in chest
Blood flares up in veins
A spell of the greatest beast
Claimer of a sleepy one
Grows hatred above itself/himself/herself
Takes peace along it

It claims the mind
Doesn't give mercy
Doesn't choose weak ones
It claims the mind
That's when every single one will lose their last scraps of hope
That beast's mighty spell
So many, many gets to feel it's pain
Gloomy and dark is the mind of a victim of the beast
It baths in hatred and gets drunk from pain, that's how it's power is the greatest.
That beast's mighty spell
So many, many gets to feel it's pain

A dream
Not a single one
Not one more beautiful memory
Nothing you may keep
Only sadness and pain
Enormous despair
Unhappy mind desires
But that power of wrath will not last for a long time
It doesn’t carry on eternally
How long can evil rule
How long can a mind wander at the mercy of fright
Not without hope can one/it rule
Then the dominion may not last
Without mercy rulers will lead their nation to rebellion
The nation/people turns against the beast
And so, and so the evil will be defeated
Then the magic turns, against the spell most wicked
And so may those dreams again, fly free.

Thank you so much for your help! I'm trying to learn Finnish and indeed find it very challenging to try and translate my favourite songs. But anyway... sanakirja.org always comes in handy, and Google Translate sometimes too

No problem! Good luck with that goal of yours.