Why do you have to retrieve Auriel's Bow in the Dawnguard DLC?
Quote from the Elder Scrolls Wikia: "The Bow was the key to the success of the Volkihar Clan's plan to fulfill the Tyranny of the Sun prophecy, although the Bow was used to kill the Clan's leader Lord Harkon before it could be fulfilled by the Volkihar Clan."
Isn't it quite risky to retrieve the bow and try to kill Harkon with it? If he actually got the bow and sacrificed Serana, the prophecy would've been fulfilled. So why help him by bringing him Auriel's Bow?
Or is the weapon actually required to kill Harkon?
I don't think so, because
- normal weapons deal damage to him
- when he activates his ward, surely he'll run out of magicka sooner or later.
So, is retrieving the bow just a waste of time?