Eh... Warcraft brought a boss from a previous expansion back once, 'resurrected by her offspring' and it was a 10 minute fight then she -blam!-ing exploded unceremoniously. It could happen but I doubt it'd really affect the story, as Bungie wouldn't -blam!- the universe [i]that[/i] much, only so they can make more of it easily.
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Which boss was that?
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Onyxia in... I wanna say blackwing descent? Something cata iirc
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Oh that one...