Destiny Eris Morn Bounty GATHER THEIR SUFFERING
You need to buy it from Xur for 1 Strange Coin. Eris Morn will then give you quest steps that you need to complete. http://youtu.be/dbW87zUagZ8
Make your way to Skywatch on Earth. Urzok usually spawns during the public events there but can also spawn in between. Public events potentially take place at X:00 – X:05 and X:30 – X:35 every hour.
http://destinypublicevents.com/ is a great way to keep track of PE times in destiny.
He is extremely strong and has a shield that regenerates pretty fast. Use your best Supers and Special weapons on him. If you are lucky like me, you have the Sword of Crota spawn at the same time which makes this quick and easy. Always go in with other players, it will be a lot less frustrating since you will have to wait about 30 minutes to get your next shot at him.