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This is a paid asset, but now you can download Fireball Prefabs Free.
Detail this asset from Unity Store: Original Link
Fireball Prefabs v1.3.1 (Latest version)
Features
• Fireball explosion
• Highly customizable, easily create new effects by altering existing prefabs
• 5x fireball prefabs
• Added Mobile Shuriken versions
Unity 2019(+) compatible
Support available for assistance if any problems should occur.