The first mission has you go to a hive temple where you learn more about Crota via Eris coming through on the space magic intercom from the tower. Your ghost tries to open a door whilst you shoot acolytes and a yellow knight to finish. You then must scan 3 hive shrines which you must defend whilst scanning Finally, Crota sends a knight Disciple for you to defeat, the knight drops a mission item when you kill him. Afterwards, your ghost says for you to return to the tower to see Eris regarding the item the Disciple dropped. Disclaimer: not an actual leak