Well here is how I took a stab at creating a lava flow for a picture I'm working on:
1. Create a mountain terrain and use a filter to give it a volcano profile
2. Create a small sphere
3. User Scatter/Replicate to produce 1000 small spheres with a rectangular region with no z distribution at all
4. With all the spheres selected I moved them over the terrain and rotated them to where I wanted the lava flow to be
5. Hit drop
6. Leave PC alone while it thinks about dropping 1000 spheres
7. With all the spheres selected hit metablob
8. Leave PC alone while it thinks about metablobing 1000 spheres
9. Select glowing lava material
10. Render
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