So I was completing my sword quest today and after I finished killing the dark blade and all the Knights the mission ended normally. I happened to open my character screen and directly under my grimoire score where the nightfall xp bonus used to be there was a new boon! I can't remember the name of it because it only lasted 10 seconds! But the details stated as such: "the power of the warden seethes uncontrollably..." I have never seen this before. I don't know if it directly related to the sword quest or that specific boss or what. Any thoughts??