Currently working on exotic sword. I've heard rocketyard is a good location, but haven't had much success.
Edit: Finished! I got bolt caster!
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Rocket yards was the best until the taken started spawning there every 5 minutes. I've had good luck in the mothyards. Two tips. 1)equip a ghost with the spinmetal sensor perk. Shaxx usually has one for sale. 2)equip a sniper. When you aim down scope it will show far away node locations. Sparrow to them and profit.