This is a paid asset, but now you can download Fantastic Fires for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Fantastic Fires v1.0
Add beautiful, fantasy-inspired fires to your game with Year Seventeen’s Fantastic Fires.
WebPlayer | WebGL (beta) | Video | Forum Page
+ Use one of several ready-made prefabs, or take advantage of the included scripts and shaders to create your own.
+ The core effect used in this series of fires doesn’t use any particles, only the glow does.
+ Full support for animations and the Animator.
Runs on all platforms that support SM3.
+ The base shader is even compatible with Unity’s particle systems and trails, for even more fantastic effects.