Is it the final phrase saying she never returned to the Sword Coast you think needs explaining? The rest doesn’t sound problematic. It would of course be wholly consistent with the approach of the series so far to just retcon her story, given she could die in a BG1 playthrough and still be alive at the start of BG2, and then die or leave Charname’s company before the end of BG2 and not get any epilogue at all. It seems perfectly open to Larian and WotC to establish a canon for Jaheira’s past hundred years that doesn’t perfectly match any specific BG1/BG2 events or indeed the BG2 novelisation (which I’ve never read) and I’d have no problem with that.
Ideally they’d leave enough undetermined, or decided through dialogue, that we can read many of our own BG2 playthroughs into her history, but given the in-universe time elapsed since the end of BG2 it’s not something that bothers me hugely. Especially if it’s just a matter of a relatively minor tweak to her epilogue ending, and having her return to the Sword Coast decades later and temporarily, rather than never, which is all that would strictly be required, though of course Larian may be more radical.
I’m guessing we might get cameos from at least one or two other BG1/2 companions, for whom events might also need to diverge from a strict reading of the BG2 epilogues. Perhaps they were written by Volo
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