On the halo 3 mythic, go to forge and go to the level orbital and when you start walk around until you find a corner at the end of two hallways where you will see two crates and a hallway above with glass windows and the side will have a yellow and black bar with cones in front of it. If you look over the rail you will see steam. Anyway, if you switch to the flying robot and go to the very top you will see two black platforms sticking out of the wall. If you look between them you will see the skull but you can’t get to it so land and turn sideways then switch back to human. Walk around scaling the wall (it may be a little hard to do but if you keep trying you will make it) and then the skull will appear in front of you in the little corner of the black platform.
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