Thunderstorm Skull for Halo 3 - Xbox 360

• Thunderstorm Skull

Mission: The Covenant

Effect: "Field promotions for everyone!" -- Upgrades enemies to their stronger versions.

After you shut down tower 1 and get access to the hornet, fly to tower 2 (the one the arbiter shut down). While walking up the stairs, go to the middle part that connects both and there should be a stair leading up to a platform where the skull is.

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