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History

As ordered by the Red Skull, Fortress Null was built around the Hammer of Skadi to defend it.[1]
Once the Serpent awoke, the fortress became his palace.[2]
It was then seen hovering above Manhattan.[3]
The flying fortress soon reached Broxton.[4]
Fortress Null was apparently destroyed in the battle between the Serpent and Thor.[5]

See Also

Links and References

Footnotes