Halo ODST Assembly SKULL (Xbox 360)
On the halo 3 mythic, go to forge and go to assembly and when you start go to the middle of the level and you will see a big tower and from the tower there are two pipes (one on each side)if you turn into the flying robot you can fly up to them and if you go to both of them and look on top of them you will see the skull on the pipe surrounded by orange bars.
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