This pin inspires my interpretation of lava bases

https://www.pinterest.com/pin/1055599907389851/

Land, rocks painting

1. Decorate base to make rocks or hight land
2. Prime with Black
3. Use mascking tape on flat base or fix with Black after drybrushing
4. Overdrybrush or stipple rock with Heavy Charcoal
5. Drybrush with Sombre Grey edjes of rock and 20-40% of flat areas
6. Drybrush highest areas of rock with Cold Grey

Lava flow painting

1. Paint coldest lava flow with Gory Red
2. Paint warm lava flow with Hot Orange
3. Paint the warmest lavaflow with Gold Yellow
4. Add melted rock with mix of Heavy Charcoal + Badlands