"Even if I can't use it now, it can still serve as my reserve."
Ivita became interested. "What magic have you found?"
The old witch lifted her hand and a quill fell into her grasp. She picked a piece of paper from her desk and drew a washbasin.
"This magic is called the 'Washbasin Water Palace.'
"You can apply magic to a washbasin, which will keep the water inside it from ever drying up or becoming stale. Even in the middle of summer, when left on your desk as time goes by, the water in the washbasin won't turn stale."
"Then, you need to put an ordinary fish into the washbasin and let it transform into your fish soldier."
The old witch said: "When you have learned this magic, you can add more fish."
"Generate more fish soldiers."
"Up to ten at the most!"
"These fish soldiers can become your guards, thus satisfying your previous inquiry on how to strengthen vigilance while you sleep."
Ivita's eyes brightened; it sounded pretty good.