Crystallizing Poison

Just like how the couple described the monster, it was a humanoid with the face of a woman and nine serpents protruding from its back. The nine-heads looked at Arthur with caution, interest, and anger. The woman's face, however, was stoic.

"Who summons I, Ruler of Seas?" the woman aloofly asked as she took measured steps toward Arthur, who was still sitting beneath the tree.

"I don't think I hold an identity that interests you," Arthur began floating before his feet touched the ground. "However, I may be capable of helping you."

"Help I with?" the woman squinted her beastly blue eyes at him as she looked around.

"I know that you aren't mindlessly commanding the monsters to attack humans. There must be a reason. I'll help you if you leave the river and stop attacking humans."

"Naive human," the monster spat. "Do you think that you are an equal of I?" it seemed pretty rageful about the fact that Arthur invited it here.