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I'd take a guess and say judging by the sharp jagged edges that he used plaster. I got a good cooling lava effect by accident. I made a rock formation out of plaster bandage which I then covered in plaster to smooth it off. Then I sprayed it black. There were a lot of natural gaps and cracks on the surface which when I went over with some terracotta paint thinned down beyond normal ,settled in these gaps and strangely when dry gave off a muted lava effect. I did a textured space marine cloak with the same method and it looks good.The raised areas stayed black with a hint of terracotta while the gaps were more pronounced with terracotta pigment.