I want to join the stormcloaks, but to prove myself I need to kill an ice wraith?

a [censored] ICE WRAITH?!!

Sir, I am the dragonborn, I killed alduin and saved the world. I'm more useful to you than twenty of your best men, and you want me to kill a pathetic little ice wraith to "prove" myself? I guess saving the world and killing alduin isn't enough proof that I'm good enough.

/rant