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I wonder what Sarufax’s gender is? And more importantly, what kind of quest can only be completed by a busty, pregnant, and nearly-naked elf? Is the keeper of the gate a horny chivalrous Tolkien fan with a pregnancy fetish, or something?
I'd assumed that Sarufax was male, but I suppose if our heroine was magically impregnated then Sarufax could be female, which would be an interesting twist.
As for why the quester has to be a pregnant female elf, well that's what the prophecy says and maybe even Sarufax doesn't know the reason for it. Maybe her condition in some way provides her with some magical immunity against whatever she's going to face. Or maybe Sarufax is bullshitting her, and has some hidden reason for making her attempt this quest.
A couple more ideas:
1. The idea behind the pregnancy could be to put people off their guard: "I'm expecting an adventurer to show up at some point, but it's obviously not her."
2. Perhaps she has to go to some religious sanctuary where, for some reason, only pregnant women are permitted to go.