You are missing the Hands of Crota and Eyes of Crota. Go into Patrol Mode on Earth. [b]Hands of Crota[/b]: Head up towards Skywatch through the Lunar Complex. Once you pass the two Dregs and enter the room with the Knight and loads of Acolytes, look in the corners of the room; if you’re going upstairs, you’ve missed it. There’s a passive Thrall here called the Servant of the Hand. Once you kill the Servant, haul arse to a safer spot; heaps of Thralls and Cursed Thralls will spawn along with a Major Knight, the Hand of Crota. [b]Eyes of Crota[/b]: For this one you need to search the Terrestrial Complex, which is where you complete the last main story mission on Earth in the core game. You can get here through Skywatch or via The Forgotten Shore. You want the area where the huge antenna array comes out of the ground. A Servant of the Eyes is kneeling with a sword in front of an urn. Kill him, then interact with the urn. The wrath of the Hive descends in the form of a Tomb ship; its constant projectiles make the battle a little tricky. Knight Servants of the Eyes and Thralls will spawn non-stop until you take out all three Eyes; they’re Major Acolytes, but not much of a challenge. The toughest thing about them is the way they run away and hide.