Ground

1. Basing Paste (Vallejo Diorama FX Dark Earth)
2. Base coat with watered down Oak Brown & Oak Brown / Matt Black
3. Wash with mixed Green Tone / Strong Tone
4. Dry brush ground with Fur Brown & Leather Brown
5. Dry brush extremely lightly with Ancient Stone

Stones

1. Glue on Slate stones (1/8" - 1/2" from Small World Slate & Stone Store on Amazon)
2. Base coat Deep Grey
3. Wash with mixed Blue Tone / Dark Tone
4. Dry brush with Ash Grey
5. Brush on Matt Varnish as the wash dries a bit glossy for my taste
6. Highlight with Ancient Stone

Lichen & Moss

1. Dab at topmost areas of stone that might grow lichen with a ratty split tipped brush to make lots of tiny random dots with glaze consitencies of Necrotic Flesh , Army Green , and Rainforest .
2. Use the same stippling process as above but only as smaller highlights or clumps with Ice Yellow and Fresh Rust

Grass

1. Paint PVA glue patches around the stones
2. Tap on 2mm Static Grass (Stonehaven Miniatures - Warm Green & Medium Green)
3. Add scattered larger tufts (Gamers Grass - Green Meadow set)

Final Result

1. Lord-Vigilant
2. Prosecutors