Hi, maybe it's something obvious that I fail to grasp but, in the main quest Serana confronts Vyrthur and it's revealed that the later created the prophecy, then, why did he make it so complicated? Couldn't he just said that to bloat the sun out only his blood was needed and not the blood of a very difficult to find daughter of Coldharbor?

Second question, through the main quest Serana tells you that killing his father is necessary to stop the prophecy and Valerica tells you that Harkon wants to kill his daughter to fulfill said prophecy, yet when you acquire the bow Serana offers her blood (causing her no harm) and you are the first to shoot it at the sun (yeah, we're going to kill my father because he wants to blot out the sun, here you have some arrows soaked in blood to blot out the Sun ???? ). Aren't you (the PC and Serana) worse than Harkon? Why did Valerica tell you that Harkon would kill his daughter when it's proven that getting the arrows is harmless?

Maybe it makes perfect sense but I cant find it.