Valiantheart said:
Perhaps the Lady just goes "missing" on the day the Blood War ends (aka another portent of things to come). No one knows where she disappeared to or why.
Oh indeed... The Lady is generally regarded as true neutral, if not beyond the general idea of morality at all. She does what must be done to protect Sigil regardless of the moral aspect or fallout of any of her actions. I could honestly see her flaying or mazing ever sodding berk in Sigil in order to further some other goal beyond typical mortal comprehension. The PC's step from the Gatetown of Torch into Sigil and find the city dead and empty, silent but for the Dabus servants of The Lady going about their tasks of upkeep. When asked where the entire population of Sigil is, the Dabus simply reply with a rebus symbol of The Lady, complete with blank pitiliess gaze and bladed headdress, and nothing more...
It's very possible to give The Lady a significantly darker aspect and interpretation than She normally gets as a benign and uncaring protector. For instance, The Lady might be more prisoner than ruler of Sigil. The Lady might simply be the projected aspect and avatar of a greater being locked away from the multiverse for a reason. The Lady of Pain as, for example, a Lovecraft-esque lurker on the doorstep, so to speak. After all, any bound space in Sigil can be a portal with the right key, and the entirety of Sigil is built on the inside rim of a giant open toroid. What if that shape itself, that bound space is a portal in and of itself? And where might it lead if unlocked and opened? *grin*
There's lots of ways that you could deal with The Lady aside from the norm, after all, our way of perceiving her is based on maybe 20,000 years of history, if that much. That's nothing in the timescale of such beings. We might just not have a broad enough scope of time to sit back and look upon to garner a meaningful idea of Her Serenity's true motivations.