Key of Osanalan

The Key of Osanalan was told by Colonel James Ackerson to be a Forerunner object underneath the city of Cleveland, Ohio on Earth. According to Ackerson, without the Key, the Halos will not properly activate. The key does not exist, however: during their childhood, Colonel Ackerson and his brother, Ruwan, made up an object called the Key of Osanalan for their make-believe games. It is likely Ackerson told the Covenant about the key to prevent them from simply destroying Cleveland, thus saving his brother.

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