In the remaining books of the Prydain Chronicles Taran's search for his true identity continues as a central theme, but further themes are also introduced.

In The Black Cauldron, the sense of danger is more immediate, the perception of evil more disturbing. In this novel the imminent danger to all humanity is the Black Cauldron, a vessel that permits the Dark Lord to bring his own dead soldiers back to life again. A heroic young bard and a princely warrior sacrifice themselves in the struggle against the powers of the cauldron. Taran finds that he is no longer an innocent living a sheltered rural life but that he must deal with the pervasive presence of evil. He and his companions leam that self sacrifice may be necessary to avoid corruption.

In The Castle of Llyr the theme of power is explored in a variety of ways...