Here's the breakdown of the pieces from my previous Flame Realm post.
All of the models were made in Houdini with these tools, but usually needed some UV clean-up or reworking. That's one of the last things that I have yet to find a consistent and good solution for within Houdini. I took care of that in Blender instead.
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This is available on the Unreal Marketplace: https://www.unrealengine.com/marketplace/en-US/product/flame-realm
Or just the lava-flow mat with a texture set: https://www.unrealengine.com/marketplace/en-US/product/cooled-flowing-lava