Yep. It’s headcanon. And here’s my source.
For gods’ sakes, the undead can cast holy magic. I have a source right here from Blizzard devs themselves on how light works.
Wowpedia
Ask CDev (Ask Creative Development) was a series of Q&As carried out by Blizzard’s Creative Development team who met with Chris Metzen and Alex Afrasiabi in order to provide official answers to fan questions concerning World of Warcraft. It took…
"Can you please explain how “light” works? The lore states that undead are physically incapable of using the light, much like the Broken, but then we have Forsaken players casting healing spells, and Sir Zeliek in Naxxramas using pseudo-paladin abilities.
Without spoiling too much, we can tell you that wielding the Light is a matter of having willpower or faith in one’s own ability to do it. That’s why there are evil paladins (for example, the Scarlet Crusade and Arthas before he took up Frostmourne ). For the undead (and Forsaken ), this requires such a great deal of willpower that it is exceedingly rare, especially since it is self-destructive. When undead channel the Light, it feels (to them) as if their entire bodies are being consumed in righteous fire. Forsaken healed by the Light (whether the healer is Forsaken or not) are effectively cauterized by the effect: sure, the wound is healed, but the healing effect is cripplingly painful. Thus, Forsaken priests are beings of unwavering willpower; Forsaken (and death knight ) tanks suffer nobly when they have priest and paladin healers in the group; and Sir Zeliek REALLY hates himself."
Alliance players can play pretend that ‘the light’ is special all they want. A direct quote from a dev of World of Warcraft, however, shatters that.
‘Faith’ can give someone the willpower to cast it, sure. But it doesn’t require faith. It all comes down to willpower. Just like any other magic aside from druidism.
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