It waves its arm, greeting you.
It takes out a notepad, which it will use to communicate with you.
It writes down that you may call it 'The Knight' or 'Ghost'.
The vessel swings its weapon, a nail, for a bit, indicating it is a warrior.
It demonstrates its magic skills, firing a magic spell from its body.
The vessel shows you a map of a kingdom known as "Hallownest", presumably being the Knight's homeland.
Ghost/The Knight awaits your response.
speak Spanish