Whatever it is, I have not been able to find out in over 60 hours of gameplay. That includes a run where I partake in destroying the grove, which led to;
Glitchy drow sex and Shadowheart getting PTSD. Wyll would have also left my party if he was in it, but I think he died in the first encounter at the gate before I could recruit him. The drow and the goblins then all betray you.
