[Boron]

As Morkilus says you get the knights of the sepulchre as freespawns when you have a castle (and a temple i believe).
But it is problematic.
First AE kills population really quick. So you are most likely not getting much income from indy provinces, you have to get that later from other nations by outrunning your dominion.
Second there is the commander problem, it is huge with Ermor.
They pop up too rarely as freespawns. And to get the bless effect you need to use priests, imho its best to use an archbishop with lvl 4 for battlefield wide bless. But he costs 20 Deathgems.

I was summoning many archbishops though, they reanimate those normal longdead horsemen.

Ermor is just one dimensional, and my build even more ;(.