There are several NPCs added by the Beyond Skyrim: Cyrodiil mod who at some point during gameplay are essential.
| Name | Found | Becomes Killable |
|---|---|---|
| Adius Vilius | Castle Bruma (Bruma) | Never |
| Aera the Devout | Camp of the Devout | After Absent Antiquity |
| Count Desilus Carvain | Castle Bruma (Bruma) | Never |
| Servus Vodaci | The Restful Watchman (Bruma), after stage 400 of The Courier | Never (disappears from the game after related quest) |