Rhapsody of Fire - Reign of Terror

 Rhapsody of Fire - The Frozen Tears of Angels (2010)

These latin lines are from the Gregorian hymn "Dies Irae". It talkes about a book which is called "The book of Life". In this book, God records the names of every person who is destined for Heaven or the World to Come.

liber scriptus
liber proferetur
in quo totum continetur

the well-written book
the book shall be brought
in which all is contained

liber scriptus
liber proferetur
unde mundus judicetur
the well-written book
the book shall be brought
whereby the world shall be judged.
 
lacrimosa dies illa
qua resurget ex favilla
Ah! that day of tears and mourning 
From the dust of earth returning

cum resurget 
pater lacrimarum
when the father of tears
resurrects

cum resurget
pater tenebrarum
when the father of darkness
resurrects

libera nos
relieve us

Rhapsody of Fire - Ira Tenax

Rhapsody (of Fire) - Legendary Tales (1997)

I'm back again. And today I gonna present you NO black metal, NO satanic rites and NO evil messages. Read and enjoy the light:

Male sit tibi tenebrarum rex
ab initio ad finem sacra ultio
cruenta pugna et epicus furor
contra mali discipulos
Ad perpetuam gloriam lucis
furor ira tenax
contra iniuriam et ruinam
rabies ira tenax

Male sit tibi tenebrarum rex
cruentus rex 

That's how the first Rhapsody of Fire album starts. Grammatically, everything is correct, which makes me happy. This is the meaning of these lines:

May you fare badly, king of darkness,
from the beginning to the end holy revenge,
bloody fight an epic rage
against the students/ followers of evil.
For eternal glory of the light
rage and tenacious wrath
against injustice and destruction
fury and tenacious wrath.

May you fare badly, king of darkness,
bloodstained king.