As far as world-building goes, Malazan led me to a few unusual places:
- S. M. Stirling's Draka series, which had its appendices published online long ago:
http://www.geocities.ws/hentaihelper/drakaapps.htm. Draka is about a works in which nobody ever did nuffin wrong and serf-humans happily serve their masters in a 20:1 ratio through the power of generic engineering. Especially its second book would be excellent to gift to a small child for Christmas.
- Crossby's Hârn tabletop RPG, about which I know very little.
- M. A. R. Barker's Tekumel, the first tabletop RPG universe and certainly the greatest, invented by an Indiana Jones-esque badass weaving around the globe during the collapse of the British Empire and the start of its replacement with the NWO. It is rather decentralized, but try
http://www.weirdrealm.com/tekumel/link.html. You should also look at the conlang(s)
http://www.uld3.org/uld27/index.html for which this series is most well renowned. Finally, the big kahuna starting-point book was just re-published (The Empire of the Petal Throne) and can be found at
https://blog.tekumelfoundation.org/2017/10/16/empire-of-the-petal-throne/ and for those outside of the West is is regrettably not yet on LibreGen, alright they claim to have a PDF version of the book. There are also more pages of Tekumel novels and novellas than is the case for Malazan, and quantity has a quality all its own, and these can sometimes be found for free.
All the stuff we find after discovering that there is more in this world than whatever generic fantasy showed up on top-ten lists when we were kids. Did you know Malazan was originally a tv script?