

The skull's effect is all player units slowly lose health from the moment they are built.

The other prisoners can be found slightly to the right of the center of the map. The first prisoner is found to the right at the beginning of the mission. In the "Lights Out" mission, rescue all ten squads of UNSC prisoners. The skull's effect is all player powers recharge in half the time. In "The Cartographer" mission, before going to the top conduit, destroy both Banished minibases on the west and east sides in the central chamber. The skull's effect is supplies from supply pads arrives 25 percent faster. Try keeping the prisoners in the back lines to better protect them. It is recommended to play on the Easy difficulty to make completing this challenge much less difficult.

In the "One Three Zero" mission, do not allow any of the captured prisoners (four prison squads) to die. The skull's effect is all player units train 50 percent faster. Note: It cannot be accessed normally send Hornets to destroy it. In the "Ascension" mission, fly to the island in the southeast corner of the map and destroy the four hidden Aug. The skull's effect is marine grenades and grunt mines explode with color. In The "Ascension" mission, completely destroy the Banished base in the northern area of the map. The skull's effect is killed grunts explode into confetti. Once you capture the third power node, it will display icons on the map with the locations of the remaining power nodes. In the "A New Enemy" mission, capture all four of Decimus' power nodes in the second part of the map. Successfully complete the indicated task (optional objective) in the listed mission to unlock the corresponding skull.
