Comment by Warrior on Lunar

@Book the simple answer is that there is no historical basis for a sword that large. The largest of great swords weighed around 20 lb (9 kg). Any larger and they were not martially viable. Swords as large as the one that dude uses would be so unwieldy and slow that their only likely purpose would be ceremonial or as decoration. So IRL, this wasnt a problem.

The way these swords cut is not through their mass, but through leverage that the two hands give and momentum. They're intended to be swung in large loops which keep the sword moving w/o starting and stopping often. Big a** swords just can't be kept moving like that and would fatigue the user quickly