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Spoiler - Highlight to read:
One of the quests to weaken the Valsharess involved the City that appeared overnight; as the Boat Man in the drow "outcast"/rebel city mentions (can't remember his name).
After doing the quests there, you will be rewarded with a mirror, the mirror the Ilithid wants.
I actually, again figured it out by myself after I posted, as I travelled to that village after my visit at the Illithids, so when I heard something about a mirror and stuff, I began putting 1 and 1 together
I just think there should have been a hint of some sort, no matter if I would have discovered it anyway as it seems to be part of the main quest or atleast the area is.