Each faction gets a beast and rider. For Ludus Magnus, it’s Nero with his rider Septimus.
Nero is is a nice bulky bull. I took the easy way out and did some shading with an airbrush and highlights mostly by drybrushing.
As my habit for Arena Rex mounts, I embedded small magnets in both beast and rider. In Nero’s case, that made it impossible to line up the reins.
But I think it’s less distracting to have not-quite-attached reins than it would be to cut them off entirely and have him just miming it. Bowstrings you can imagine, reins less so.