Yeah, i was thinking about setting it on the editor because i tested it and nobody else gets the Tenebrium skill (I have a separate character for bartering and neither he nor jahan and madora get the skill if i tell them to leave and then get them back) after that quest, which leads me to believe it's a one-time event.
The only other source for the tenebrium skill would be the book, and it doesn't solve things for the 4th character.
Is it possible to add this to the editor.
Or would be creating the book multiple times possible ? and if how