You found a mysterious girl on the shore next to your castle. She was wearing an improvised dress, and wasn't able to speak.

She smiled brightly when she noticed you. She looked so pretty, just like a mermaid. But mermaids aren't real, right?

"What's your name?"

You asked, she tried to say it, but it was like she didn't have a voice. Then, she wrote it in the sand the name "Cass".