Some hints on LA R'lyeh vs LA Ermor?

[Saxon]

Here is another tactic that my may wish to use. 20% of the cultists that you recruit or auto summon have astral and can join a communion. They also have holy. Banishment does not cause fatigue.

So, throw together 2, 4 or 8 of the cheap assassin mages and have them cast communion slave. Put all your S1H1 cultists in one army and have them cast communion master. They will get a boost to their Banishment, which will help you clean out the undead. You will really see the difference at 8, but even at 4, it makes a big difference. The extra penetration helps, but it is the area of effect that really sorts out the chaff.

Your other mages can cast what they like and not worry about a fatigue death.

You will get lucky as well and find that some of them gone insane for a turn and become prophets. With the H3 boosted up to H5 or H6, you can really hurt the undead and will even start damaging some of those with high MR.

I rename all the S1H1 units so they are easier to track. With all the insanity of this nation, you will have commanders misplace themselves, and you need to work tracking them.