This is a paid asset, but now you can download Warzone FX Free.
Detail this asset from Unity Store: Original Link
Warzone FX v1.3 (Latest version)
“If possible, please buy the package to support the developer”
This Warzone FX pack provides a collection of atmospheric effects and pyrotechnics for any combat zone.
The full list of effects include:
* Flaming Smoke Crater
* Burnt out/flaming car wreck
* 2 Big flame explosion
* 1 Plasma explosion
* Ground/Dirt shot dust effect
* Exploding barrel
* Exploding crate
Sound effects are included, along with a desert environment and test area scene.