How to translate フォー・ダークネス

So this is from 時間停止勇者. I initially thought this フォー is "four" (i.e., ショゴス is one of the four mid-bosses collectively called ダークネス) because having four mid-bosses is a very common trope (aka 四天王 or "Elite Four").

However, in a recent episode, I found that a small unnamed enemy is also called a フォー・ダークネス, so now I think this フォー is "for" (i.e., beings that work "for darkness").

I doubt "foe" is relevant simply because this word is way too difficult to average Japanese readers.

Either way, we may have to forget how it sounds to English speakers, and you do not necessarily have to translate something like this literally.