Start the Story Mission The Dark Beyond. Get to the objective Resist The Hive, after you deploy your Ghost on the dead guardian. When the door of Temple of Crota opens. As the door open, various Hive enemies rush out. Just shoot as many as you can but don't kill all of them. Let them kill you so you respawn at the start of the objective. Repeat the process for many times as you want.
When you're done you can go back to Orbit. Go get back to the farm spot, make you you choose RESUME not restart at the mission selection screen so you respawn back at the gate of Crota Temple.
- You can choose whatever difficulty you want, for level 20+ players, level 9 The Dark Beyond is recommended so enemies do not die too fast.