Nadia considered the answer again and questioned,

"Shouldn't be first know if the Banshees can communicate of show signs of intelligence? Or if it tangible... No, wait -" her eyes popped open. "I got it. They are definitely Spirits. After all most intelligent creatures are regarded as beast because of their violent instincts. The Banshee is a dark creature, therefore, cannot be considered a tame Being. Hence, it must be a Spirit."

She finished happily.