Go to the Arena and get a few claymores. Then, go directly south of the Imperial Waterfront to a place called the Old Bridge. Move west and follow the road until you reach a ruin that starts with a "V". Go inside and get past the minor creatures. You will find a girl named Umbra. There is one broken pillar in the room. Use the bench next to it to jump on top of it, then stand at the edge. Use a ranged attack to have her start attacking you. Then, take out the claymore and just start hitting her. She has a lot of health and does a lot of damage -- do not fall off the pillar. If done correctly, you will have full Ebony and a great sword without getting touched.