#Bhaal is the last survivor of this city thus the inheritor ->

[y-rhywbeth2]

It just occurred to me that there might be a way to make a headcanon to tie in the lore of Orin's dagger (that Bhaal was killing in back alleys in the place where Baldur's Gate would someday stand, despite him predating the existence of alleys in the area) with the lore from Lord of the End of Everything (he's from High Netheril), and also explain what the Undercity is and where it came from.

So High Netheril was composed of enclave cities, which were enchanted to fly. When Karsus and Jergal wrecked the Weave those went smashing straight into the ground, leaving behind only refugees who managed to get out one way or another (Bhaal and Bane apparently amongst them). The empire of Netheril was focused over what is now the Anauroch Desert, but some enclaves floated elsewhere, such as Ythryn, which was situated far North in the Icewind Dale. At least some cities, such as Ythryn and Undrentide, are now subterranean, buried beneath the earth/sand/ice.

Bhaal's mortal life was apparently spent in the flying city called Rdiuz - if that city was flying over the spot where Baldur's Gate would one day be built, crashed and was buried, was forgotten except for by, say, its former spymaster/government hitman turned god... he would technically have been murdering in the back alleys of a city before the Gate.

There is the question of why Bhaal has a temple in the ruins of a city that died before his ascension, but that wouldn't necessarily stop him sending followers down there to build one/hijack an old temple of Jergal when civilisation kicked off in the area and that smuggling hub that will one day be a major city developed.

So Orin, Durge, and before them, (kind of) Sarevok, are/were living in the long-dead forgotten city of their father and ancestors in this headcanon. Hey, some of those undead haunting the place might be their grandparents! Or great-grandparents, aunts, uncles, cousins... fully mortal half-siblings? Step-parents?