Forcing a quest completion mid-dialogue can leave characters in weird states (e.g., Geralt with his sword drawn permanently, Yennefer floating, Roach stuck underground).

| Quest Name (In-Game) | Internal Quest ID | Complete Quest Fact Command | |----------------------|------------------|-----------------------------| | Family Matters (The Baron) | q104 | addfact(q104_completed) | | The Last Wish (Yennefer) | q302 | addfact(q302_completed) | | A Towerful of Mice | q204 | addfact(q204_completed) | | Now or Never (Triss) | q209 | addfact(q209_completed) | | The Isle of Mists | q310 | addfact(q310_completed) | | Through Time and Space (Avallac’h) | q505 | addfact(q505_completed) | | Reason of State | q206 | addfact(q206_completed) | | Scavenger Hunt: Cat School Gear | q201_cat | addfact(q201_cat_completed) |

This tells the game you never began the quest, auto-failing it. To force a specific failure state, find the _failed fact:

The Witcher 3 has a butterfly effect. If you type addfact(q104_completed) for "Family Matters" without doing the preceding Velen main quests, you may permanently break the main storyline. You will lose access to the Crones, the Whispering Hillock, and multiple endings.