[If the Priestess had bothered asking, that was the half-life essence of the little mermaid she'd taken in order to make the other potion for the Prince.]

There's little to do when coming to land is a right of passage for a mermaid and the alternative option, at least you wouldn't like. However, now you can keep the mermaid in check by being a mermaid yourself and leave the Prince to decide his own life.

And don't worry about payment; mermaids aren't supposed to have souls.

[And with that, she disappeared back into the water, the jellyfish with her going out until the Priestess was alone.]