Slash Trail FX Elemental v5.2+

Each Elemental Type Has Weapon Material, Slash Trail FX, Sword FX, Aura FX.

You can check How to apply FX to Animation in video.

Elemental : Ice, Water, Fire, Electric, Basic, Dark, Mystic, Sand, Wind

Features:

You can check Shader Complexity in Video. to check Optimize
You can change Color, etc..
You can see How to Apply Slash FX to Skeletal Character Animation.