Oh I can breakdown one more thing.
For the decal I created this texture in substance separating it into Alpha, Emissive, Height and Normal map and then did some simple shader magic to make it look like on the video.
I also made a ash decal, though for it I created a simple shape of directional splash in photoshop and then modified it in substance to get cooler look:
Then even simpler shader for it as it’s just alpha with dark color.