The true flourishing of the Warehouse. The many rulers of the Roman Empire contributed tens of thousands of artifacts to the facility in the belief that it kept the empire safe and powerful. There may have been something to that, as they were in power for over 500 years. The sword that belonged to Marcus Aurelius that was ultimately used against him; the crucifix that belonged to Constantine the great - longest undisputed ruler of the entire Roman empire; the lyre that Nero played while Rome burned. Warehouse 3 resided in the Western Roman Empire until the rise of the Hunnic empire threatened Rome and Constantinople, and Attila the Hun appeared on the horizon.
On a rainy day at the Warehouse, Pete accidentally triggers an artifact that transforms the team into two-dimensional diorama versions of themselves, and returns the Warehouse to its original, unstable design.
Who knew Claudia had those moves?! OK, so maybe they're artifact-induced, but we're so in love with the spangles, we don't care!