Emissive kept simple yet realistic. Imagine where the lava melts and how it should melt instead of masking the cavities and using it as emissive. This way is doing two methods combined to get a more belivable result.
Height Breakdown, here the Non Uniform Directional Warp, Slope blur, Non Uniform Blur nodes helped quite a lot.
Animated Video on how the lava material works, just a single slider to do this kind of flowing lava illusion. This one is using 1024x1024 textures.
I'm back with another material since a very long time I didn't post something new, I made this one when I was extremely bored yesterday as a fun quick material. Tried to expirement with some Ideas and see how the result comes out. I hope the small breakdown below helps & let me know in the comments what do you think about this material :D