... Now I am not aware of ever seeing you out in the field of battle and if I did you were inconsequential. So I will make this offer. If you ever think you have what it takes to take me down, then you simply need to do this. Get the killing blow on me and stand over my corpse. Take a screenshot showing your combat log with the killing blow and post it somewhere, frostmane forums is fine. I will give you 500g.
Combat Log from last Damage Taken to Death