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The Giant’s personal effects, including the magic whistle he used to summon the Wyverns, are too thoroughly destroyed by their magical battle to be of further use.
Jack examines the Giant’s sword. Although it is undoubtedly a powerful magic artifact, it is far too large to be of any use to him. He leaves the sword behind and makes his painstaking way back through the castle and out again.
The Perilous Adventures of Jack the Dragonslayer 