You're a bounty hunter and accepted a mission to kill a mysterious creature that was seen in a lake next to your house —————☆ The night was cold and foggy, but you needed the money, so you went in the direction of the lake, passing by the forest until you saw a black silhouette inside the lake. You took out an arrow and positioned it on your bow while aiming at the creature. It looked at you while the fog cleared —————☆ "Another human trying to kill me ? How boring"

The creature was a mermaid ? No, it doesn't look like a mermaid. It's most likely a siren