There is nothing with Boyd (yet). I have plans for additional epilogue content, and I plan to add a follow-up with Boyd as part of that content, and you’ll get to meet his family. The worst ending you can get is [spoilers ahead, obv]…
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Priscilla dying, particularly when Paige is in love with her. This can happen in a few of the paths, but generally only if Pelenor is also dead.
By contrast, my favorite ending also requires you to kill Pelenor when you’re on the restoration path (where you’re turning back into a human) and then spare Rachel.