"evil power" is a perfectly correct and usable phrase in written English.
For example, you could use it in the sentence "The evil power of the dictator caused the country to suffer greatly."
He still has evil power".
To many Africans, this evil power is witchcraft.
It clung to him with an evil power.
The shock was not of a Hussein-like figure stripped of all evil power but of evil power revealed in an unexpected light.
Then evil power comes and takes control, and leads it in another direction".
Mr. Khokar, in turn, told a reporter that Mr. Mian was using his "whole evil power" to declaim the parade.
The evil powers are "Blood Frenzy" (granting an immunity to damage and extremely powerful melee attacks), "Turn" (turning undead enemies into allies), "Black Shroud" (stealing life force from nearby enemies) and "Soul Stealer" (destroying nearby enemies and stealing their souls).
With evil powers and everything.
(Von Ziegesar recalls plotting out a now forgotten series that featured a baby with evil powers.
Liquor had not got the best of my life, but I knew well its evil powers.
