Not really, considering we have other class abilities that have "on kill" procs. Victory Rush, for example.
Black Arrow in WC3 is an auto-attack buff, so nine out of ten times, you're killing the mobs with Black Arrow. In WoW, though, Black Arrow is a
damage over time debuff. So it's easy to kill a mob under the effects of Black Arrow.
Except the WoW version of the WC3 ability is a dot, so it's super easy to kill a mob under the effect of the Black Arrow debuff, considering considering the ability has no CD.
It is the WoW version of it, though. The only difference is that BA is not an auto-cast buff that increases auto-attack damage, but an active ability that leaves a dot instead of dealing direct damage. Everything else about the spell is the exact same.
According to logic, that is a red herring. That says a lot. The priest's mind control ability being considered a charm is meaningless.
Because necromaqncy is not the kind of stuff you find in nature. Necromancy, by its very design, is unnatural.
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Can you show me an example of a paladin using frost magic before Wrath, though? It doesn't matter that the current NPCs don't do any of that. It's a possible part of their concept.
In other words: they were paladins who turned evil. Just like I wrote. No death knight prior to Wrath were once anything other than paladins. And yet the death knights of today come from all "classes" and characters. Which is why saying "all dark rangers are undead quel'dorei hunters" is meaningless.