weapon name: Ascella
description: The sword looks like a regular Katana despite the fact that the blade has a blue tint and is somewhat transparent.
weapon special abilities: Ascella can produce Carbon Dioxide. When the substance mixes with Oxygen, Nitrogen and the water vapor in the air, it creates flames. She ignites the sword like a match. The reason behind the flames being blue is because of the purity of the flames as opposed to yellow or orange flames which are "tainted".
history: Ascella can produce Carbon Dioxide because of eating the Gasu-Gasu No Mi: Nisankatanso (Gas-Gas Fruit: Carbon Dioxide).
((I wanted to give a reason behind why Ascella produces Carbon Dioxide so I hope that the sword eating a fruit is appropriate enough))