This doesn't need to be a clean and proper translation. In fact a rough, curt, dog-latin translation would work perfectly. I'd use a translator, but i want it to be at least grammatically proper.
Tasogare yori mo kuraki mono
Chi no nagare yori akaki mono
Toki no nagare ni utsumoreshi
Idainaru nanji no na ni oite
Ware koko ni yami ni chikawan
Warera ga mae ni tachi fusagarishi
Subete no orokanaru mono ni
Ware to nanji ga chikara mote
Hitoshiku horobi wo ataen koto wo
One who is darker than twilight
One who is redder than flowing blood
Buried in the flow of time
In thy great name,
I hereby pledge myself to darkness
Those who stand before us in our way
All those who have become fools
Merge your power and mine
To grant destruction equally to all!!
It's had several non-direct translations over time.
The final "Dragon Slave!" is rendered in English in the original work, but I think could benefit for being rendered into Latin.