Larian knew that having a detailed world would pay dividends in Baldur's Gate 3. To achieve this, the game is full of alternative routes, hidden passages, dialogue options, and items to keep players discovering new things each and every playthrough. Some items act as a key for other things later on, leading many players to dither over what to sell. One such item, the Dark Brain, is far too lovingly rendered to be a simple trash object — especially since it appears to be part of a set.