Mission 6: Evacuation
Thunderstorm Skull – This particular skull requires you to complete a quick little challenge at the very beginning of Halo 5’s sixth mission. There are traffic cones that you can destroy, and destroy them you must. Destroy five of these bad boys in two minutes or less to trigger the Grunt Birthday Party sound.
That sound means you’ve done what you need to do, so proceed to the end of the level where you’ll find the skull on a bridge. The Guardian will be glowing up ahead, and the skull will be on a bridge leading to a platform.
Mission 7: Reunion
Grunt Party Skull – This one is relatively easy to find. Begin the mission and proceed until you reach the first Covenant encounter. Once there head to a tunnel to your right and follow it to the right. Eventually you’ll stumble upon a Grunt sitting down singing to him self. Push the poor sap off of its seat and there will be your Skull.
Cloud Skull – Continue the mission after collecting the first Skull in the area until you’re almost at the end. Cortana will comment on the Blue Team being the first humans in this area in a very long time. When she does, do not step onto the bridge. Use this time to head to the path on your right and follow it up the hill (you’ll need to keep to the left). Follow the path to its end to find this Halo 5 Skull.
