I find it interesting too. But a Tanar'ri would be too powerful for BG1 and BG2 SoA (unless put somewhere in Hell by the very end of SoA). So if not in SoA Hell, it should be included in ToB (or Watcher's keep).
if implemented id definatly suggest someplace after the underdark, possibly in the small teeth pass or something where you couldnt get it pre-underdark. or if before allow the lesser demon lord that murders the matron mother comment on it, some flavour text absently commenting on mortals playing with demon fire. gotta love npc interactions on items. your carrying around the most deadly and fabled weapons in faerun, and NOONE mentions that you're carrying around Satan's pitchfork of death. its why i always loved the Githyanki silver sword arc.
Tanar'ri are subcategory of demons, not some specific demon. Some tanar'ri are strong like Balor or Glabrezu and some are weak like Uridezu ( small rat demon ). What kind of demon you want in that flask @Samus ?
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Some tanar'ri are strong like Balor or Glabrezu and some are weak like Uridezu ( small rat demon ).
What kind of demon you want in that flask @Samus ?