From publisher blurb:
Rusthaven is a sourcebook for the roleplaying game Numenera and adds new creatures, organisations, descriptors and foci, new NPCs, a completely new set of Iron Wind-caused mutations known as ‘corrosions’ and, of course, the location of Rusthaven itself. It covers multiple types of Iron Wind, how society reacts to them and the prejudices that exist out of fear and ignorance towards the Wind and the people affected by it. A new system for creating random cyphers created by the Wind itself is included, alongside a collection of new artifacts and oddities.
Filled with new artwork, a complete mini-adventure and several adventure seeds, Rusthaven has everything you need to bring the Iron Wind into your game. Taking inspiration from the body horror subgenre and the weird of Numenera itself, Rusthaven explores both the dark and the bizarre, the bleak and the hopeful.