The Ancient Weapons from One Piece are incredibly mysterious, but there's a theory that could potentially connect them to Haki!

The green-bladed weapon was eventually joined by ... representation of his duality as well as a glimpse at ancient Jedi weapons. Jedi Master Qu Rahn is a Clone Wars veteran, Jedi Purge survivor ...

When fused with a weapon it gives the following Attack Power ... Shield: +50 Attack Power. However, because Ancient Blade is the remnant of an enemy, it is also best used in elixirs and increasing ...