I am not sure what you are trying to ask exactly, but trisons do exist in CoE.
Here is a link to their wiki page
Here is a concept art of them as well as a link to a gif of them if you click here
Do you have any questions about them?
Trison may be used as mounts or to pull medium or large sized transport vehicles or siege weapons. As well as War Trison are trison that are wearing armor.