joins Taran, Fflewddur, and Gurgi on their journey to warn the Sons of Don of an advancing attack (though Taran asked Fflewddur to take her back to her own kinsmen, she refused to the point of threatening to break Fflewddur's harp over his head if he tried). She attempts to halt several Cauldron Born at one point with an enchanted arrow, but it does not work as she intended. When they are captured by the Fair Folk, she convinces the king to give them Hen Wen, provisions, and a guide to Caer Dathyl. Eilonwy also agrees with Taran's decision to rescue an injured young gwythaint. When the group must pass through a valley with the Horned King's war band, Eilonwy rides with Taran and leaps at the Horned King to try to protect him. When Taran wakes up in Caer Dathyl, she tells him what happened and helps him recover. Throughout the book, Taran presumes Eilonwy to be - apart from her enchanted heritage - an ordinary girl, and she makes no effort to contradict the presumption. At the end of the story it is revealed to him that she is a princess, and she is invited to make her home in Caer Dallben. Post-Book of Three After the events in The Book of Three, Eilonwy comes to live at Caer Dallben, home of Dallben the enchanter and Taran. She accompanies Taran on many of his later adventures, and her courage and determination never falter. We later discover that she is the last living descendant of Llyr Half-Speech, the Sea King, which is why Achren abducted the girl as a small child. She is the only one capable of reading a tome that requires the light of her bauble, which only Eilonwy can cause to light. Because her magical tutoring under Queen Achren was incomplete, her ability to perform magic is severely hindered, though she retains and displays certain inborn abilities throughout the series. Physically, Eilonwy is described as blue-eyed, with red-gold hair (though the film The Black Cauldron depicts her as a blonde). She has a good heart, but is very determined to have her own way and quarrels frequently with Taran, although the quarrels do not last long. She is never without her "bauble" – a magical ball that she can make give off light, which sometimes shows things not visible under ordinary lights. The Castle of Llyr,