Larian Studios Forums Baldur's Gate III Baldur's Gate III - Technical & Gameplay Problems [BUG] - Mystic Carrion Broken Quest Flow For Oskar Fevras (ACT III SPOILER)

That's one way to legitimately spoil oneself in-game.

If the player comes across the Mystic Carrion without ever even seeing Oskar Fevras in Baldur's Gate, the dialogue about Oskar being possessed will still be available regardless and significantly spoil that part of the quest.

Here's an example of a character who hasn't seen Oskar yet in Baldur's Gate, yet having full access to dialogue about him they can't possibly know;