Larian Studios Forums Baldur's Gate III Baldur's Gate III - Technical & Gameplay Problems Thorns Stone missing

Well I’m stuck I have Gortash and Orin stones but not thorns why??? How could I’d advance without that stone you can’t sell it so wth is it????? I have played 157h not to get stuck by the boat leading to kill the main boss!!! HELP

what i think happened is that Thorne welt from clif to abbys and his stone is forever lost and by the game bug i did advanced to next act without that stone wich is a major BUG! (and no no one of my companions do not have it) is there a way to kill big brain without that stone?