I like the idea of creatures that exist in ALL the planes/worlds/dimensions/(call them what you want), Add in a sort of mental health for a player as well, and you can do the Cthulu RPG thing, creatures appearance/presence can have an effect on it. That way players who have sensitive character (Sensitive as in able to see/effect other planes) have the benefits from mutiple planes, but also a few weaknesses, If my char is insensitive to these creatures, he can be ignorant of their horror, and "ignorance is bliss", whereas if I can see all the nasties around me, the shock can start to pile up until.... (insert generic horrible thing to happen here)
|