In my games with him he never ends up more than 5" from the deployment zone. I have shuffle my army around (with the archers and discordia the only constant) so the problem don't seem to be the army (but it may be that is why I created this thread).
My main problem seem to be that I feel I can't protect him. I have used the Thanes, Phoenix and Artificer as bodyguard (I proxy Aspis once, I guess I should try it again). He still get very dead.
Don't get me wrong I clear most of my opponents armies but me being outnumbered don't help (usually not an issue with others casters) since whatever survives defeat me eventually. I just can't see to finish the game with Ossy.
Note: play scenarios is not an option our meta outside of SR is caster kill.