The Heretic

The Heretic is a Children of Atom quest in the Fallout 4 add-on Far Harbor (add-on).

Bugs

 * If you choose the option to spare Gwyneth and tell her to leave the island, she may still show up inside the Nucleus later doing random stuff like sweeping the floors and is completely unresponsive to any attempt to talk to her.
 * Doing this quest alongside Hunting the Hunter may result in a bug where the player is only able to say "Hey, Dejen." This bug persists through saves after the conditions to start it are met: After the player talks to the Grand Zealot about Sister Gwyneth, they leave The Nucleus before talking to Theil and kill the Courser. When the player returns to talk to Theil, they will only say "Hey, Dejen." to all NPCs, and none of them will respond, not even Dejen. The only way to fix the bug is to revert to a save state before killing the Courser.