Shadow?

[Bovel]

Kaghuros is right and so far religion and faith-powered powers are rather easy. It's when you begin to look into Elune, Loa, shadow-worship for to non-dead and even druids that things start to get tricky cause there is not enough info on those.

[Aphetoros]

My above sentence was speaking of living human warlocks/priests.

[Miah]

Rightie, from reading up on the subject as a kind of hobby, I found that, in a good few cases, as long as the priest limit's their usage, they can posses a limited use of illusionary/mind based magic that branches under the shadow tree. The best example of this is the in-game character, Argent Confessor Paletress. The character is a good as good get's, holy to the teeth and a member of the argent crusade, Yet she also uses a branch of shadow magic, in the form of bringing up the memories of others for them to confront. And I believe this is the turning point for using faith-based shadow abilities. If the caster believes they are doing good, they will not lose their faith, and Paletress seems to revolve around this ideology. "Even the darkest of memories fades when confronted."

Rather than tapping into some shadowy plane of magic, instead she taps into the thoughts of her opponent, forcing them to confront memories of their past, so that they may move on to further better themselves, as if using the shadow within others to remove the shadow from them. So from this all i can gather is, mind based abilities, would be available to a Priest of the light, if they used it to improve the quality of people's lives, reaffirm their faith in the light and banish the evil from within them, in a very zen kind of "There is no light without shadow" Kind of way. Now, of course, if she ever used a shadow bolt, or mind blast or other simply offensive ability, then she could stand to cancel out her faith in the light and lose those abilities entirely, but heck, that could make for good RP in itself, someone having to go back, repent and reclaim their abilities anew.

So believing in the light would make it near impossible to use shadow abilities? Well, not if you rethink them. Just as an example, the shadowfiend ability, look's like a purely evil form of shadow magic, to force a creature of the shadow to do your bidding. But rethink the ability as bringing up a person's (non literal) inner demons, such as a bad memory, and having them combat it, in the hopes of casting it out entirely, is much less evil. The shadowfiend could be a a manifestation of a bad memory, given a form.

Shadowfiend is a tough one because of just how evil it seems but, hey, use your imagination, the skills are there, and its up to us to interpret how they come about, as it's A shame if you have to bottleneck your characters into pure good and pure evil, everyone has a darker side, and it's how the individual uses it that would determine how others look upon it.

[Kaghuros]

Well, all Priest magic is mind magic. So you wouldn't be able to rend someone's sanity, but you'd be able to soothe anger or do other "good" things with mind magic coming from faith in the Light. The grey area is mind-influencing magic, generally, but that's where your character's perceptions of right and wrong are. A Shadow Priest might rebuke an enemy with fear, but a Holy Priest would turn them with a commanding presence or a kind thought. It's the difference between "I use my power to control and destroy my enemies" and "I use my power to do right, and turn away my enemies so that they can't harm me."

Consider that Shadow gives you no defensive skills and a host of crippling attacks to use as mitigation, whereas Holy gives you a host of barriers and heals and damage prevention skills but only a handful of attacks. Refluffing Shadow attacks as Holy only works in a handful of cases. Bringing out someone's inner demons in order to hurt them is Big "E" Evil. It's twisted and sadistic, which is why only Shadow users can do it.