The Cavern is the tenth chapter of The Castle of Llyr. It increases tension by removing the protagonists from their quest, creating a sidebar adventure, as in the first two books in the series. The theme that a selfless thought is like a light in the darkness is introduced.

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The pit into which Prince Rhun had fallen opened up into spectacular caverns. None of the party could initially light Princess Eilonwy's bauble, but it glowed for Taran after he turned his thoughts to Eilonwy. With its light the group explored the caves and eventually found a weird, gigantic figure, which announced itself as Glew!
The Castle of Llyr
1. Prince Rhun | 2. Dinas Rhydnant | 3. The Shoemaker | 4. Shadows | 5. The Oath | 6. The Potions of Glew | 7. The Lair of Llyan | 8. The Harp of Fflewddur | 9. The Luck of Rhun | 10. The Cavern | 11. King of the Stones | 12. The Tomb | 13. The Ladder | 14. The Empty Book | 15. The Island | 16. A Meeting of Strangers | 17. The Spells of Caer Colur | 18. The Golden Pelydryn | 19. The Flood | 20. The Pledge
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