Yeah, that warbling that you hear throughout the battle themes? Those are actual words being spoken, and not just gibberish. What's more, Shōji Meguro revealed that they're passages from the Book of Revelation… but also never posted the lyrics, nor the translation he used.

So, me being me, I decided to give it a crack. Besides, it's not like anyone else was trying. There's been efforts in trying to make out "Forced Battle" over the years, but that's about it.

Here's what I've come up with:

通常戦闘
And there shall be no more curse.
But the throne of the Lamb shall be in it.
And His servants shall serve Him.
And they shall reign forever and ever.

Passages used: Revelation 22:3, 5

通常戦闘～街～
I heard from heaven saying to me, "Write: 'Blessed are
the dead who die in the Lord from now on.'"
"Yes," says the Spirit, "that they may rest from
their labors, and their works follow them."

Passage used: Revelation 14:13

通常戦闘～大マップ～
Do not fear which you are about to suffer.
You will have tribulation ten days.
Be faithful until death,
and I will give you the crown of life.

Passage used: Revelation 2:10

強制戦闘
I saw the horses in the vision:
those breastplates of fiery red.
And out of their mouths came
fire, smoke, and brimstone.

By these three plagues,
mankind was killed—
by the fire and the smoke
and the brimstone
which came out
before God.

The Lord, our God! Alleluia!
God! The Lord, our God! Alleluia!

Passages used: Revelation 9:17-18, 13; 19:1

ボス戦闘
Their tails are like serpents!
And with them they do harm! [Revelation 9:19]
Strike with all plagues! [Rev. 11:6]
Drink of the wine of the wrath of God! [14:10]

(War broke out in heaven!) [12:7]
Their tails are like serpents! [9:19]
(War broke out in heaven!) [12:7]
And with them they do harm! [9:19]
(War broke out in heaven!) [12:7]
Strike with all plagues! [11:6]
(War broke out in heaven!) [12:7]
Drink of the wine of the wrath of God! [14:10]

FEAR! Fear God and give glory to Him!
For the hour of His judgment has come to you! [14:7]
NOW! When the thousand years have expired,
Satan will be released! [20:7]
Judgment has come to you! [14:7]

Note: The final "war broke out in heaven" is most likely being sung in tandem with the final line before going into "FEAR!"

"Forced Battle" is the only song that has all of its voiced lines separated into multiple files. Despite it sounding different, I wasn't able to find two clips that ended with "wrath of God", and the files were ordered from one to twelve, with none of the numbers being skipped.

Hence, the only conclusion I can come up with is that the lines are either being played simultaneously, or they're blended together to make a 'new' line somehow.

I recently learned there's a "Common Battle" from a beta with alternate lyrics, but motherfuck trying to piece that together (right now).

Besides, I don't even know if that's taken from the Book of Revelation, or if Meguro pulled it from some other source, or even if he just made it up on his own.