This is a paid asset, but now you can download DEATH SKULL Free.
Detail this asset from Unity Store: Original Link
DEATH SKULL v1.0
Here is a scary dangerous death skull ready to lunge at your hero characters and deal some terrible damages!
Geometry is 3.6 Ktris, rig is 32 bones. Model uses 3 materials (head, wings and glowing transparent eyes). Textures are up to 2048*2048.
12 quality animations are part of the package.