Kadaokawa Cover
Slayers Special Vol. 24: Threat of the Underground Kingdom (Japanese: 地底王国の脅威 Romaji: Chitei oukoku no kyoui) is the twenty-fourth book in the Slayers Special novel series, written by Hajime Kanzaka and illustrated by Rui Araizumi. It was published on April 20th, 2005 by Fujimi Fantasia Bunko/Kadokawa Shoten Publishing. It contains 3 2-chapters episodes previously published in the Monthly Dragon Magazine of July, August, September and October 2004, and January and February 2005, plus a new standalone episode specifically written for this novel.