The harbinger matchup

Band of Heroes really doesn't do anything to stop Martyrdom which triggers on DISABLED. Takedown triggers on BOXED so the theme benefit not applicable here at all as it doesn't stop Harbinger from using Martyrdom.

Clouds are one option to use as they help protect your forces from guns as they close in. Kolgrimma could be quite useful here as she has clouds and a magical spray which will help when dealing with Vilmon and Paladins.

My personal favourite for playing into Menoth is Gunnbjorn. His feat will let you deliver your models into combat without being molested by shooting.
Rockwall is really good against Menoth jacks as they do not have pathfinder and therfore you can really hamper their manouverability.

Explosivo can allow your beasts to shoot Menoth Heavies even through the Choir buffs and gives you some RFP against High Reclaimer lists.

Snipe is really good on a Glacier King. If you play Gunnbjorn in Storm of the North, and take a Glacier King with the Northkin Stone Attachment then the Glacier King can aim and put three fully boosted Guided Fire RNG16 POW16 crit freeze shots into Harbinger which considering she is DEF14 ARM 14 will pose a significant threat to the Menoth Player such that he will try to protect Harbinger a lot and may not Martyr much.

The key to dealing Martyrdom is having a multitude of attacks to force Harbinger to Martyr either a little or a lot either one of which.can be quite strong as long as you have some boostable gyns which can threaten an assassination.

Yoi don't really need to worry about Purification as if the Menoth player casts it he is more vulnerable to a ranged assassination through either Bombers or GK and he will most likely nkt be able to fully fuel multiple warjacks without being vulnerable.

Back when Harby was all the menoth players ever used (AKA MK2) the key thing was to have a credible ranged threat, so you can prevent Harby from just Martyring down to 1 if she wants to. Make sure you have something that threatens her if she gets too brave. If she can just hang back and martyr and then heal up she will ruin your game. If she is scared of dying she cant really do that, and you will have a much better time.

The monks are incredibly annoying. Having something to lower their DEF means you can more easily "kill" them and force martyrs. Something like Grim 1 could be very effective. Just dont build a totally ranged focused army, or you would have a bad time against their other jack spam list...

As Trollock has said The best way to beat Harby is to point guns at her.

Grim 1 seems like a really strong option. His Feat, + mantrap to knockdown Shield guards. He also allows himself and up to 2 other models to ignore cover so the wall becomes meaningless. You can probably consistently assasinate Harby and have enough attacks to grind her down on attrition.

Also, continuous effects make her sad.

I beat a VERY similar list at LVO by dicing things with a Glacier King, but in general I think Madrak SotN beats this. High volume of quality attacks and high enough defense to give their troops problems, your feat ensures you'll hit their lines first, and they really struggle to kill the Glacier King if you can position around the threat of the Hammer Dwarves and grind them down.

Like others have said, Grim1 is also a decent option. I'd also like Gunnbjorn into this.

Totally fair.  Theres an added Order of Operations kink based on her life pool thats important to consider before attacking pieces.

Played the matchup at the Conquest event twice and the way I see it you have three options.

Play Grim2, he hard counters Harby and your opponent will absolutely not drop her into you as you can't martyr models with Mortality on them.
This means you'll probably see the second list which would more than likely be Amon. The European Menoth players are all in a big facebook chat and they discuss this. He will know not to drop into Grim2

Or

Play Madrak1 into it, It's a very grindy game and going first is hugely important as is knowing when to cast guided hand. Some turns Guided hand is way more important than Even ground!
You also need a Madrak1 list with a high number of attacks plus you want to threaten their caster so you want a list with a bomber in.

Or

Go the spray route. The list keeps Harby safe behind a wall with 3 shield guards. The best way round all of this is to take Grissel2 and a Mountain king. Spray her to death if she gets too low.
You can play it in any theme and it'll work.