Tales From The Unconquered Planet: The Underworld Cup and Trouble with Gresslons.

Two great books for kids aged 8 plus.

Fantasy Adventures full of crazy characters and humourous plots. Good versus evil of course; a world in peril and buckets of yukky stuff, with a sprinkle of education and some great chapter illustrations.

Find them at trevorpripley.com and https://www.waldorfpublishing.com/product/tales-from-the-unconquered-planet-trouble-with-gresslons/81