Raid the Emerald Grove alongside her, killing all the tieflings, to unlock her as a companion (and share an amorous moment). How to knock out Minthara in Baldur's Gate 3 (Image credit: Larian Studios) ...

The Emperor will note how the Elder Brain has evolved into a Netherbrain and that it cannot be dominated by the Netherstones any more. Follow The Emperor into the skull to continue.