I hate horrors

[Actuarian]

For regular battles, you can surround your horror marked pretender with chaff troops set to guard commander. Then the horrors can't immediately get next to you to attack.

For strategic spells and random events, equip items that increase the number of allowable guards, then give yourself some size 4 guards; it will help some.

You can always use the hunter of heroes nerf mod and create your own that nerfs all the horrors.

[Wish]

the best way to survive horrors is to have a REALLY high magic resistance. All their attacks are MR negates.