[Amos]

Have you considered making most of the summons combat-summons? Have you considered making your custom horrors sent-summons instead of normal summons?

That would mean the Tetsu are controlling the Horrors not the other way around.

You can also add spells that give them the ability to horrormark enemies more efficiently, for example.

They got "Astral Claw" for that.

Are there any other spells you might want to add? Examples of stuff I can do now:
* A blood/holy spell that only blesses magic beings.
* A spell that gives all sacred magic beings on your side (thus, all your horrors), say: berserking, fast movement, etc.

Why would you cast a spell that blesses only magical beings when you have extremely low requirement spell that blesses them all?

Do you know what happens when you copystats a horror and then summon it as a non-neutral? Does it still favor horror-marked enemies or not?

I would guess that they would act like the original unit, but thats just a guess.