Voodoo: Now that healers have that heal from a distance ability how about a harm from a distance ability for shaman. At global ranges maybe just have it do some damage, when done from the same area perhaps do damage and have a side affect like get tripped if you geta pin in the leg or bleeding for a tick or two, minor things but extra snazy.

Conceal Aura: The evil bastards that they are, evil shaman can disguise the aura those using detection spells see. Making an evil shaman appear goodly at a glance. This could have some fun rp lines and also could affect things like angels/demons weather or not npc healers will heal you and so on, though it is after all just a disguise so all spells that take moral into consideration should stay the same.

Power word purtify: Covers the victim with a putrid odor that causes them to gag and vomit (like a short duration emetic) and also can contaminate food and drink containers on the victim (giving them plague/poison if they eat them) and temporarily putrifys potions (potions out in inventory will give plague/poison if quafed within a few ticks of getting blasted by this)

Alz heimers: Victims hit with this prayer suffer from a partial lack of memory. this would be like using berserk, a flat skill percentage drop across the board less so on perfected things.

Total Darkness: The room is filled with total darkness, everything in the room at the time stops glowing for a while and the room gets tagged dark so you need to use infra vision or sharpen sight or something along those lines.

Hah, I love voodoo. Imagine you could stick a pin in a certain place for a certain malediction, but the person you were casting it upon could have an ability to find the source of the voodoo. So the target could take the malediction and live with it, or use their ability to find the shaman and engage in battle to end the voodoo.