"Good girl." Catherine once again reached out to stroke Isabella's head and said softly, "Be good and tell the brothers and sisters what exactly these things are."
"Meow." Isabella squinted her eyes and hunched her back, making a comfortable purring sound under Catherine's touch. If she had ears, fur and a tail, she would be just like a kitten nuzzling her owner, boasting with a triumphant expression and enjoying her owner's praise and rewards. After enjoying it for a while, Isabella finally opened her eyes with reluctance, murmuring, "Those things cannot be considered living beings, but semi-living beings. People are accustomed to calling them nightmares."
"Nightmares?" The other four looked at each other, capable of confirming that they had never heard of such a thing before: "We do know what nightmares are in the usual sense, but what do you mean by these nightmares?"
