"Deathrider" (Omen)

Death rider, you've taken the earth by storm

Death rider, out of sin and hatred you were born

Ride against the wind, shameless killer in the night

Rape another village, before the break of light

Trample down the ashes, grind them with your hate

Take another helpless life, before it's too late

"Harder than Steel" (Jag Panzer)

You put their heads on the grinding wheel

Give 'em hell 'cause you're harder than steel

Oh, you're harder than steel, yeah, ya feel

All for yourself and no one else

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Now of course you can say its just two examples, but it seems to be a decent representative of common themes in power metal lyrics. Obviously the best way to find out would be performing a similar data analysis as the article.

edit: These are both famous power metal bands, in case there was a feeling they were from any other genre:

https://rateyourmusic.com/release/album/omen/battle-cry/

https://rateyourmusic.com/release/album/jag-panzer/ample-des...