By what means does the King wage war?

Question

A King over all
The nations will fall
His garment of white
Its hem stained red
The darkness made light
For sinners he bled
In one hand a sword
The word of his power
In the other a symbol
Of Earth's final hour.

I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have have the keys of hell and of death.

Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.

And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.

By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.

Ye are my friends, if ye do whatsoever I command you.

Answer 1

He shall break them with

A ROD OF IRON

because

the biblical verses quoted are Rev 1:18, Rev 15:4, Rev 15:6, Rev 9:18, John 15:14 and converting those numbers to letters via A1Z26 yields AR OD OF IR ON, a clear reference to Psalm 2 (taken at least by the librettist of Handel's Messiah as messianic).

The initial bit of verse in the puzzle, so far as I can see, is

standard-issue Christian imagery (a lot of it, again, taken from the book of Revelation) with nothing puzzly embedded in it; I assume it's just there to give context to what king is being referred to.