The Giant Blade was a broken off section of the sword to a large, headless gladiator statue.
History[]
On October 23, 1937, archaeologist Indiana Jones found the Shrine of the Gladiator during an investigation into Mithraic activity beneath Rome. Inside the chamber was a group of statues with a giant, decapitated gladiator in the center surrounded by four other fighters all standing over a small maze built into the floor.[1]
The central image was missing its sword in addition to its head but Jones found the Giant's Blade laying nearby and reattached it, revealing it to be the handle of a centuries-old mechanical puzzle.[1]
Although someone or something evidently wanted to keep the identity of who was depicted a secret, Jones encountered the imagery's likeliest source of inspiration below the Colosseum and found that Emperor Nero's champion was more than capable of holding his own without a weapon to hand.[1]

