on_use = function(itemstack, user, pointed_thing),
    local pos = pointed_thing.under
    local node = minetest.get_node(pos)
    if user:get_wielded_item():get_name() == "bat_crystal:energy_staff_1"
    and node.name == "default:dirt_with_grass" then
    minetest.set_node(pos,{name = "default:sand"})
    end
end,