#Astarion can enjoy himself in something like sunlight doing his usual shenanigans and exploring what the universe has to offer

[y-rhywbeth2]

Do you have any idea if the light that provides a day/night cycle in Sigil counts as sunlight for the purposes of vampires? Because you mentioned in one post that the Dark Urge's only hope is fleeing to Sigil, and I was wondering if Astarion might also like to move there.

I mean it's not Durge's only hope, it's just probably the safest option... or they could deliberately piss off the Lady and get totally obliterated from existence, that sure solves the Bhaal problem.

I think I remember this kind of topic starting arguments. I've never seen an official answer for this and don't know how the issue has been handled with vampire characters in previous supplements, but I do know that, according to official rules from on high, exact wording of the RAW is important when it comes to vampiric weaknesses. For example, taking from a conversation with Jeremy Crawford about the viability of killing a vampire using a water elemental:

Harmed by Running Water. The vampire takes 20 acid damage when it ends its turn in running water. - Monster Manual (5e)

'What if a Water Elemental uses its move to repeatedly go through the Vampires space?' 'A water elemental is a creature, not a body of running water (a stream, a river, a waterfall, or the like).' 'But an elemental that is made of water, and runs, would that not be a running body of water? ' 'It would, indeed. Running body of water =/= body of running water.'

So following the spirit of the logic from that baffling conversation; according to the RAW, the daylight in the City of Doors shouldn't bother vampires because the vampiric weakness, in exact words, says 'in sunlight.'

Sunlight Hypersensitivity. The vampire takes 20 radiant damage when it starts its turn in sunlight. While in sunlight, it has a disadvantage on attack rolls and ability checks. - Monster Manual (5e)

And Sigil and the Outlands specifically says that the light, in exact words, 'isn't sunlight.'

Day and Night. Sigil observes a 24-hour day-night cycle. The sky gradually fills with luminescence during the day and fades into deep darkness as night. This light isn't sunlight. - Sigil and the Outlands

And even if they are bothered by the light, Sigil is a pretty good place to unlive and, boasting markets and stores that brings in goods, gossip and residents from all over existence, isn't a bad place to go looking for things that can cure you or let you walk in sunlight or whatever. Considering one of the factions and the undertaker industry is undead, there are probably businesses that cater to them and their needs. It's the most cosmopolitan place in existence, and the undead are legal citizens (although, if the lore from the Libris Mortis holds, you might need a license for feeding and agree to follow restrictions about not murdering people). For a guy whose idea of a good time involves the city life full of shenanigans, intrigue, danger, violence and etc, Sigil's a pretty good place to be if you don't get killed pissing off somebody powerful or fall into a puddle that's actually a portal to the paraelemental plane of ooze or something.