Magic Flask

The Magic Flask, or マジクバッタル (lit "Magic Bottle") is an item in Final Fantasy XV used in the creation and execution of Elemancy. Each Magic Flask is filled with a crafted spell that can be used a number of times before the flask is emptied.

Design
The flasks oddly look very little like a flash or bottle, as their name would imply, instead looking like a sphere with small, transparent designs that show the glowing spell housed within. Because of this design and how they are used in the game, they have been referred to as "spell bombs" or "magic grenades."