Made several improvements to the Poltergeist enemy: they are now revealed on being attacked or hit with Radiant Spirit Guardians; they will not turn Invisible again if they are still in a character’s See Invisibility aura; in Balanced and Explorer Mode, they have disadvantage on Dexterity Saving...
Now that you’re in the city proper, you won’t be able to confront the Elder Brain until you gather the three Netherstones controlling the Elder Brain’s Crown of Karsus. You already got one after defeating Thorm in Act 2. The other two you’ll have to pry away fromOrin the Red, ...