'''Effect:''' All convenant enemies become special ops.
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''''''How to get to the skull''':''' After you take out the second room of covenant boarding the ship, the game says "Priority Shift". Shortly after this you will go to the armory where you will have to take out a couple of Elites. The next room is "Commons B.01". Clear out all of the enemies on the ground floor and the Grunts in the far landing that are manning the plasma turret. Once you've cleared the room, look towards the outside -- literally out into space. You should see the dual tram tracks, and some diagonal supports holding up the tram tracks. You'll also note that the diagonal supports in the center are close together. One of those supports goes down the side of the wall near where one of the glass railings is. You can jump on the post for the glass railing and jump up onto the diagonal railing. From here, jump to the tram track and follow it all the way down towards the door you originally came in. You should see a landing with a trash can. The skull is in/under this trash can. Simply walk up to the trash can and hold X to pick up the skull.