As Lead Campaign Artist I oversaw the campaign corruption creation for WH3. The main challenge was balancing lots of crazy colours and assets which needed to be clearly different for each faction, but also work together and remain readable.
I created many corruption prefabs and variants for the 7 different corrupting factions, as well as the vegetation (apart from the Tzeentch grass which was made by Tjalle). I also made some of the corruption terrain textures.
The campaign env art team who all worked on parts of corruption-
https://www.artstation.com/tjalle
https://www.artstation.com/ashleyheppell
https://www.artstation.com/glowingworm
https://www.artstation.com/matthieugueguen
https://www.artstation.com/dandoombuggy
https://www.artstation.com/jaku