Base Elements

1. Magnets on underside
2. Cork
3. Slate Rocks
4. Tile Grout
5. Extra Plastic Bits (swords, armor, sprus)

Paint

Airbrush

1. Prime/Base coat Coal Black
2. Lava Base Mephiston Red
3. Lava Tone Troll Slayer Orange
4. Lava Heat Averland Sunset
5. Lava Hotspot Bold Titanium White

Drybrush

1. Overbrush Mechanicus Standard Grey
2. Highlights/Edges Screaming Skull

Details

Paint all of the extra little bits. Skulls, armor, weapons, etc.

Finishing

After gluing minis to the bases, slather Mordant Earth over some of the exposed lava.