‘To fight evil’ —> ‘use the Power of Darkness’
Evil will eventually consume you (beware).
The ‘only way’ to ‘fight evil’ is ‘with Good’ (by doing so, you’ll never be consumed by evil):
“Do not be overcome by evil, but overcome evil with good.” (Romans 12:21)
“Good” is difficult indeed especially since it may require you to ‘lay down your life instead’.
Remember ‘this fall’:
“The fallen ones were in the earth in those days, and even afterwards when sons of God come in unto daughters of men, and they have borne to them — they are the heroes, who, from of old (the age), are the men of name (re-known).” (Genesis 6:4)