How to get out of there?

"Are you real?" But the water spirit just laughs, and answers "We are all the dream of gods, fleeting and immaterial, some of us are hardly believable!" But the answer didn't make any sense to Liandra.

"But you did heal me, right?" And her watery self answered "Yes I did" As if in a ballet dance, Aquis pirouetted closer to the princess. It did seem like she was very lucky, and the spirit was benevolent.

"Thank you" she relaxed and felt as if she could ask the dancing spirit just about anything "How do I get out of here?"

"You make a deal with me, or you waste away!" There is a small touch of humor in Aquis´s voice, who made a side leap, splashing of water in Liandra´s direction.

"What is the deal?" Liandra was now slightly affraid, perhaps this wasn't a good spirit at all.

"Four tasks I command thee,
Yet five you shall perform
A Criminal you shall forgive
A Knight you shall insult
A Merchant you shall rob
A King you shall defame"

The spirit sang with joy, and repeated the gimmick four or five times as she spun in place. It was expecting an answer, how should Liandra reply?