Nurse

The nurse is an NPC that heals you fully for 2 silver coins, and 25 copper coins. She makes funny comments, such as "Eww... What happened to your face?" For her to appear, you need to first have a standard NPC room, including a table, a chair, a light source, and a door, and you also need to have more than the five hearts you started out with by breaking a heartstone with a hammer.

In order for nurse to appear, everyone must have at least 6 hearts.