Speaking of Snorri's gear I would like to make all of, or most of anyway, his loadout geared toward being an anti-caster.
His natural dwarven anti-magic aura is already super strong giving him the trait;
"Winds Dispersed: All Enemy Spells will suffer -15 automatically if Snorri takes the field, -25 to roll is Snorri is actively trying to dispel it."
With this I figure we could give him a set of armor, a cloak (Banner), and a talisman that all have the Rune of Sanctuary which increases the potency of a dwarfs natural anti-magic aura making it a combo of combos that makes all enemy Spell casters weep.
Armor: Master Rune of Gromril, Rune of Sanctuary, Rune of Spell Breaking
Cloak: Master Rune of Valaya, Rune of Sanctuary, Rune of Spell Breaking or Rune of Sanctuary
Talisman: Master Rune of Purification, Rune of Sanctuary, Rune of Spell Eating
Overall a set that makes enemy casters just unable to function. Let warriors like Otrek take on the physical threats of the enemy while Snorri takes on the more esoteric threats.
Personally I'm not that keen on replacing the cloak due to sentimental reasons and value and I think that thematically there's actually some support for Daemonward to mess around with casters if they are Daemons because it wards against them. Additionally if the enemy caster is a Daemon if Snorri loses a battle roll against such a caster he can have a chance to reroll it.
From a more rune specific perspective the Rune of Sanctuary is also present in the Daemonward combo as it is with your other suggestions, so there is some connection there.
Now in terms of your cloak suggestion I think it'd do something to make him super resistant to magic attacks aimed at him if we used the Rune of Spell Breaking. It'd likely make a Runic Combo, so it is a very good idea but I think we have something that works as is and has character history and may still work for a set bonus. Effectively saving some time.
The Talisman because it's using the Master Rune of Purification is rather similar to both the Conversion combo and the Adamant Maker combo. The Master Rune of Purification channels an immense amount of magical energy in order to force the Gromril to become Adamant. During the process of its discovery Snorri likened it to the rune of Spell Eating.
You don't know how long it's taken you, but you've created two prototypes that you've put inside the warded room you made to handle Master Rune experimentation. Both are based on the original Runic Array in the protected room you're standing in rather than the weakened form of your talisman. They are still weak compared to that potent array, and the area they can affect is pathetically small, but they are both stronger than your amulet; strong enough that they need to be stationary to work. Ignoring all of that, the one to your left is an otherwise lightly-modified version of the array. Instead of waiting for the magic to occur it is meant to draw it out of the metal instead. The one to your right is a slightly different story.
Replacing the Rune of Spelleating is an entirely new and different Rune. One you were inspired to create by the persistent memory of your ghostly pick striking the meteor. The shape, from what you can tell, is derived from the Rune of Spelleating but clearly different in a myriad of ways. You don't really know what it will do, you have an idea, a hunch, but no concrete proof.
The array on the left is one that blew up the bar, but the right hand side which eventually became the Master Rune of Purification worked.
So the Master Rune of Purification is a derivation of the Rune of Spell Eating and like the Purification rune the Rune of Spell Eating is about taking in and transferring magical energy. That's what it does in the Conversion combo. So I'd conclude that the Adamant Maker combo is only in effect, a derivation of the Conversion combo, which is supported by the research process we went through and how the Adamant Smelters are reminiscent of the static Conversion combo used to set our workshop up for Master Rune experimentation.
It is a painstaking effort that forces even you to speak this Rune's chant to aid you, only having ever done this twice before.
It was one of the earliest universal Runic combinations that every Runesmith who held the rank of Master or higher was taught, if only because it was needed to experiment on the Master Runes safely.
In function it was the basis for your talisman, turning magical energy into a shield that in this case defended the room it was inscribed on.
In reality these were the originally discovered forms of the Rune of Spelleating, Spellbreaking and Warding found by Thungni. A work so potent that it put the portable array you were taught and inscribed on your amulet to shame. Within a space of a certain size, this Rune array would consume the energy of a Master Rune's magical feedback and turn it into a self-sustaining shield that was meant to contain the explosion itself by eating the magic and converting it.
The passage where this static Conversion form is brought up.
The point of all of this is that I think the Master Rune of Purification is effectively an incredibly souped up form of the Rune of Spell Eating that does something different with the energy involved,
so a better rune set up to get what you want in my mind would be using the Rune of Spell Breaking in the talisman. Rune of Sanctuary and Rune of Spell Breaking are both about resisting magic after all, even if they go about it through different means.
So in effect what I'm suggesting is:
Armor: Master Rune of Gromril, Rune of Sanctuary, Rune of Spell Breaking
Talisman: Master Rune of Purification, Rune of Sanctuary, Rune of Spell Breaking
And using the Cloak we already have. To be clear all I'm saying is that I am reluctant to set it aside, because it works very well and has character history and may possibly create a set bonus, but there are theoretically ways to set it aside and maintain that sentimentality. Among other things its possible to make these Armor and Talisman's and then see if the Daemonward cloak makes a set bonus with them. In my mind that basically makes it less of a binary. Even by itself your Cloak idea is interesting and I think has promise. If we went with a rune of Spell Breaking on the Cloak, and the Talisman and the Armor, that'd be three different instances of the rune on Snorri which I can only assume means he'll chuckle at most magical attacks as they do squat to him.
Your talisman idea as well might have an interesting effect of the Rune of Spell Eating feeding more power to the Master Rune of Purification, which is probably why you included it, and end up doing something subtly different than if we used the Rune of Spell Breaking so its worth checking out.
All in all I like the idea behind the suggestion. And I think we can poke these without using up our mats because of this:
Research doesn't consume mats, but what it rewards you with can, and in this case will, need resources to make.
No comment on doing voidstone research beforehand
Unless
@soulcake you were conceiving of the Combo Tester as using up mats during the process of testing Combos.