[Taqwus]

Results May Vary, perhaps.

It'll cause insanity in anybody and anything that isn't a void thingy, although MR might have an impact. Friendlies, enemies, stealthy types, your hordes of freespawn cultists, pretenders... everybody. And insanity is completely incurable, AFAIK.

/Although an 'Arkham Asylum: Enter for treatment', that reduced insanity by (2d6 - 1d6) might be appropriate.