Masking a Material Texture Sample for Displacement

Hello!

I hope everyone a great holiday.

I’m using UE 5.5 and trying to create a dynamic lava material. Here is what I have so far:

What I would like to do is add displacement, but only for the dark portions. I have no idea how to go about it other some kind of masking seems logical. Any ideas/suggestions?

Convert the texture into grayscale and use the grayscale for height/roughness.

Thanks. I did it a little differently and converted my grayscale lava maps into normal maps and plugged them into the material Normal:

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