See Challenge # 112.

I wanted a way to present the distance of civilization the Pale Ones have by making harm or nerf class types, but there's no way to easily portray that mechanically and I have no idea what class types would be common (if any are more common than others) in Danahar.

I like the idea of a creature which nerfs things that see it. -1/-0 is a good idea, although it will often just be equivalent to +0/+1 toughness. I can't think of anything better though.

Reminds me of Flanking but slightly less problematic. Nice flavor.