Cloud sprites are one type of sprite; creatures which are described in the ancient "Booke" which has been memorized by the village eldress in Lower Posada.
“
Cloud sprites and wind sprites be varied. Some rain pour, some wind roar, others hurl their thunder. Harvests to protect from them, takest thou a knife of iron, new, of a mouse's droppings a half ounce, of a grey heron's fat —
”