Concept art for the Aurochs Creatures for Exodus: Rising (currently known as Forsaken Realms: Vahrin's Call).
https://linktr.ee/titan_roc
The Aurochs was the world's version of the workhorse, actual horses being considerably rarer in this fantasy realm than they are in the real world. A larger, more woolly, buffalo-like creature of prehistoric proportion.
The idea for the Aurochs was pretty set in stone from the beginning, having been given the general direction of 'big badass cow'. But I also drew a lot of inspiration from Mastodon and woolly Rhino when establishing anatomy.
Being the workhorse of the world they needed the equipment to keep them useful. Developing saddles and other equipment was a necessary part of the process.