Go to Archon Shrine after talking to Scythe at Snowspire Village. There should be a number of Balverines and Undead, or just Undead. Go to the area to the left of the cullis gate and go up the hill. After that, go back down and take out your bow. It is recommended to have mastered Multi Arrow and Accuracy, but this is not required. Use Multi Arrow and shoot the enemies. It is possible to get over 400,000 experience points for Skill in a couple minutes. Your combat multiplier should also increase to over 200.