can walk on the surface without penalty?
what happened to :
Sunlight Sensitivity: While in sunlight, the drow has disadvantage on Attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
one may also ask how in the hells a 1 or even party of 4 drows got kidnap in baldur's gate.
Because at their Hearts, Drow are Expansionists. For the last 2000 years, they've been shackled to the underdark by Lloth. She's literally been holding them back.
Over the last 2 centuries, the Drow have been infiltrating all the major cities across the Sword Coast, whether through crime syndicates or politics.
Undoubtedly Baldur's Gate has tens, if not hundreds of Drow skulking the shadows, or walking around in broad daylight. Many have adapted to surface.
I agree the Drow would get significant penalties in daylight. The illithids have a huge presence in the underdark so it is quite realistic that Drow are being kidnapped by them. Probably easier for the illithids to kidnap Drow tbh.
Except Illithids and Drow have a long history of cooperation (allying would be too strong a word.) It would be quite unusual for Illithids to take a drow as a slave or host for their parasites. Not unheard of, but very unusual because while the Illithids consider themselves superior to all other races, they 1) consider drow to be closer to being on equal terms than other races are and 2) they fear drow reprisal.
This uses the assumption that the Illithid that caused all of this, was from an underdark colony, and ignores the fact that the Underdark Illithid do not have nautiloids. They lost that knowledge. (This is from what we know from previous games and lore)
This Illithid most definitely doesn't come from the Underdark, nor the Astral Sea. IMO, (and this was my theory even before EA) It hails from the Shadowfell, and may have came back around the same time as Thultanthar, or used similar teleportation magic to leave the Shadowfell. Given the prior NWN games, and the recent interventions by the Netherese in the novels, the Illithid colonies struggling to maintain order against rogue illithid. It's only a matter of time for Illithid that have been
outcast by the material plane Illithid, to come back with vengeance, and show off their superiority.