Spartan Shield from the Peloponnesian War

Origin
The Peloponnesian War (431–404 BC) was an ancient Greek war fought by Athens and its empire against the Peloponnesian League led by Sparta.

The 426 BC Malian Gulf tsunami was a tsunami devastating the coasts of the Malian and Euboean Gulfs, Greece, in the summer of 426 BC. Thucydides inquired into its causes, and concluded that the tsunami must have been caused by an earthquake, He was thus the first to describe the cause of tsunamis. His predecessor Herodotus, in contrast, had earlier attributed the Potidaea tsunami to the divine wrath of Poseidon.

The Malian Gulf tsunami was caused by one of a series of earthquakes in the summer of 426 BC which affected the course of the Peloponnesian War by forcing the advancing Spartans to abort their planned invasion of Attica.

Effects
When hit, much like a gong, the shield sends out a wave of energy that pushes water into a small tsunami that can destroy ships and anything in the path of the wave.

Collection
Henry Every acquired the shield in 1693 after seizing a cargo ship secretly going to England to send this shield to the British Royal Navy for protection from pirates. After discovering it's power, Henry started to use the shield against his enemies to sink their ships.

Once the Regents of Warehouse 10 found out that Henry had the shield, they tried to intersept his ship, the Fancy on numerous occasions. On all accounts, they failed. It wasn't until Every stopped in Great Britain where Warehouse 10 regents apprehended him with the shield left on his ship, they collected it and set course to the Warehouse, along with Henry. It was collected by Regent Grishma Hara on July 8th, 1696.