[Desolator12]

this could work...
casting Darkness would create a dark aura around you (say a CM of dark on the screen and it stays around you). It gives you a temp AC making monsters miss sometimes, but so do you unles you have a RoN (ring of nightvision) or something of that sort.

Light would work the same way, except it's an aura of light around you instead of dark, it illuminates what's in front of you better, but it grants NEGATIVE ac to you AND the monsters.

in this way, a superdarkness (idiot casting darkness on one spot) couldn't be made, and casting superlight (same as above)
can't be done either.

the deitys should be classified good/evil. in this way, if you have a good deity, you would use Holy Servant and it would be a type of avatar for that god, but if you have Cult Monster, it would create that deity's Monster-like avatar.

stealth should add AC to your character. because when you use stealth, you are harder to see, thus harder to hit.