* This angelic weapon is referred to as the "Sword of Lucifer" in [http://www.acedmagazine.com/index2.php?option=com_content&task=view&id=3107&pop=1&page=0&Itemid=54 the official episode summary] released by The CW, although it is never referred to as this in canon.
* Angel blades, while rarer in the earlier seasons, gain more prevalence in the later seasons, particularly after the revelation that they can kill demons as well as angels. The discovery that [[Asa Fox]] had one caused the Winchesters to comment that he was a serious [[hunter]]. In later seasons, angel blades have mainly taken the place of [[Ruby's knife]] as the Winchesters' main demon-killing weapon.* In season 13, angel blades are the only weapons used by the Winchesters to kill demons.
[[Ruby's knife ]] is only used again by either of the Winchesters against demons in [[14.01 Stranger in a Strange Land]].