Baldur's Gate 3: How To Open The Sinister Door In Cazador's Palace
The ritual palace chamber where the ancient vampire Cazador plans to sacrifice victims of the city in can only be reached when you open a locked Sinister Door. Getting to the final area of this Act 3 dungeon is extremely important for Astarion's questline. Only by collecting two other items in the palace will you be able to unlock the boss battle found deep within this dungeon.