How to beat Late Age Ermor?

[Alderanas]

o sry i haven't tried to play mp yet so i am referring to sp. Well last time i played against them I played Bogarus. I started out ok trying to mass produce the elite horsemen bodyguards. I took over a dozen territories quickly then ran into groups of ermor ranging from 100- 900. I had lots of priests and different types of mages mixed into my forces balancing out holy and regular magic. The biggest army i was able to amass on the field was over 350 of those elite horsemen near the middle of the game. I also had armies of the swordsmen ranging out behind that army supporting it. I took alot of territory but somehow ermor just kept pumping out legions of dead that were very overwhelming. While i fielded an army of 350 they were slamming me with armies of 2000-3000. I was slowly overwhelmed. near the end the gath started to attack me too. In the end I got desperate so I wished for horrors. lots of my astral mages were killed but i did get some horrors. but by that point ermor had enveloped me and was besieging my capitol with over 10000 soldiers which was quite ridiculous.