This page contains Halo 3 Hints for Xbox 360 called "Thunderstorm Skull" and has been posted or updated on Sep 27, 2007 by Irra. Let us know what you think of this Hint by thumbs voting.
In "The Covenant" mission, shut down Tower 1 and get access to the Hornet. Fly to Tower 2 (which is the one that the Arbiter shut down). Go up the stairs. Go to the middle part that connects both. There should be a stairway that leads up to a platform where the skull is found. Its description reads "Field promotions for everyone!" Enemies will be stronger.
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