Just thought to note that even if Illidan and Arthas die in-game, Blizzard still has the (very likely) possibility of ignoring it. After all, they have stated in the lore that the Black Temple was an impenetrable fortress, so they can simply ignore the fact that players killed him off and say "Well, it also remained impenetrable!"
Even though they are killable by players, it shouldn't be presumed that they automatically die in the lore too.
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