This is a paid asset, but now you can download Dragon Flames for FREE, but please remember 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
Dragon Flames v1.0
“If possible, please buy the package to support the developer”
A dramatic realistic dragon flame special effect.
The dragon fire collides with the environment and includes yellow and blue flames, sparks, smoke and sound effects.
The example dragon featured in the video is available for free here: http://bit.ly/2bVck3d