The Fireball is a weapon that can be obtained outside the Lunar Soul Castle in Lunar Shadow ZERO.
The Fireball appears to be an orange gun with a blue handle.
The Fireball is automatically given to Evan O'Neill by Selena Daria van der Merwe outside the Lunar Soul Castle.
The Fireball bounces along the floor, but is unable to destroy breakable tiles.
- Due to Lunar Shadow and Selenic Shadow being Cave Story mods, the Fireball remains entirely unchanged from the original game. It is unobtainable in Lunar Shadow and Selenic Shadow.