 Using the sword, Michael can kill all sorts of otherwise immortal creatures including demons, fallen angels, and, in one case, the dragon Siriothrax, that had captured Charity.The truest basis of the Three Swords is that they seem to reduce and eliminate any and all supernatural power used against them, turning a lopsided fight into one dependent upon skill and willpower ... and often a great surprise to many extremely supernaturally powerful beings.However, at the end of "Small Favor", Michael entrusts Harry with the keeping of the sword until a new bearer can be found for it.