If you hit Dawnbreaker with a powerful fire or ice scroll you can duplicate it, that's what I did. It will remain in the pedestal but the copy will bounce around in the last chamber so you will have to look around a little bit but it will be there. Dual Dawnbreakers looks pretty cool in an extra dark dungeon, not to mention the extra large " holy " explosion from the effect it has on undead.
well it is more effective against undead also get spell breaker it has a permanent ward that if i remenber right blocks 50 points of magic you can get the quest at the shrine of Peryite near The Shrine of Peryite is located in http://elderscrolls.wikia.com/wiki/The_Reach, far to the northeast of http://elderscrolls.wikia.com/wiki/Markarth. Place your marker slightly northwest of http://elderscrolls.wikia.com/wiki/Karthwasten. It is directly southwest of http://elderscrolls.wikia.com/wiki/Dragontooth_Crater and http://elderscrolls.wikia.com/wiki/Harmugstahl did'nt think those would show up oh well it's fine i guess vamps love to cast spells goes well with sword
Vampires are undead, so it has the same effect on them as it does on draugr.