This is techno-sorcery!
Unite India is here: https://unity.com/event/unite-india-2019
there is no need to create a vdb, but it works yes
Environment Artist Dan Attwell has been making games since 1999. He works at Ninja Theory Ltd as Principal Environment Artist and creates amazing stuff for the game Hellblade. We hope he can give a little breakdown of how he created those amazing scenes, what assets and material he uses and how he renders all that in Unreal Engine. Meanwhile, take a look at the scenes, and spread the word if you like them!
You may not notice but the ground looks pretty realistic, especially mud and dead leaves. Awesome textures!
You can find more of his works on Artstation.