The current implementation of this spell causes you to hostile random NPCs after utilizing it, as well as the displacements hostiling you and some times not even doing anything.
I think what should be considered is the removal of the darkness part of the spell.
While the darkness is nice, I believe that it does nothing to the overall contribution of the spell. I believe the invisibility is enough for anyone to utilize it as an escape. It also, currently, breaks the invisibility part anyway, and if I had to choose one over the other, I'd definitely want the invisibility
I've inititally jus disabled actual darkness effect. For now, until I have chance to do some larger scale rework on how some things work and then I may enable it as effect that won't cause faction issues.