This is a paid asset, but now you can download Heroic UI 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
Heroic UI v1.0
Heroic UI is a complete art set of UI components, icons, buttons, that will suit perfectly to your game project.
All components are of a high quality and implemented in a professional level and have transparent background so you can place it on any surface you need.
Heroic UI includes:
– Layered PSD.