I see several powers in V20 Dark Ages that mention "ground" or "soil" in their description (though not always in the System portion of the description).

Protean 4 - Earth Meld (or Interred in the Earth as it is called in Dark Ages) requires a Kindred to touch the ground to activate the power (specifically not a stone or wood floor).

I'm thinking of powers like Koldunic Sorcery 2 - Rouse the Molten Rock which causes lava to "boil up through the ground".