Who, exactly, do you think the Cult of Gazul is going to be fighting, other than the chaos dwarves, that an anti-scrying/anti-magic rune would not be useful against? The priests of Gazul are specialists. If they're seeing combat instead of their more typical duties, it's a) the undead, b) chaos dwarves, c) chaos generally or d) weird shit which is likely magical in nature.
Again, given their purview and ranger-y combat culture, the wardstone rune would be a massively valuable addition to their armour in just about any typical situation they would deploy.
Fair question, so heres what we've been told about the commission
[ ] [Simple] Grave Wardens: [Cost: 12 actions] Due end of Turn 42. Productivity like No Other will proc. Gain 70 Favour and 1 Standing with the Cult of Gazul. Just as the Cult of Valaya has the inkling of a great colonization wave, the other Ancestor Cults have also taken notice. The local Cult of Gazul has come to you for the same reason the Cult of Valaya has, to arm their most senior members with the kind of equipment befitting their station, both current and for those future Dawi who may take up this most sacred of duties.
And since they say its the same reason as Valaya has heres is that.
(*Updated*)[ ] [Simple] Armoured Maidens: [Cost: (12 -6) =6 actions] Due end of Turn 40. Productivity like No Other will proc. Gain 70 Favour and 1 Standing with the Cult of Valaya. The Clergy of Valaya are making plans to expand the Valkyrie Guard in preparation for what they believe is a coming wave of colonization across the Karaz Ankor in the future. Given your history with the Cult, they've come to you wondering if you had the inclination to create armour for some of the future Valkyrie Guard that will no doubt come from the endeavour. The number is not the sum total of suits, but ones specially made for their eldest and most veteran Matrons. The foundational core of the future Valkyrie Guard in these future-Holds. The Cult will hold the suits in their vaults until such a time they are needed.
I think the wave of colonization is more relevant than the hold emphasis because I do see the Gazulites as more rangery than the Valayans. However we are also arming their senior members and I think its a reasonable assumption that these members are going to generally be kept mostly sedentary because of them.
While in a hold, the equipment is mostly likely to see use in its defense, in the recent updates for example we've seen from Khastahs PoV that smaller holds do have to fight off roving hordes of Beastmen.
While doing more rangery things, our best example is Logain, although he is unusual in his relationship with corpses I think his duties or his interpretation of them is likely to be more normal. In these circumstances its seeking out dwarves that have met bad ends while travelling and giving them rites of some sort.
People (sorry I forget who) did previously bring up that the young and experiencing relatively rapid growth is the phase that a hold is most vulnerable to Hashut infiltrators, however anti scrying is not very useful here as the big problem is identifying acolytes. And I think them escaping after identification because of scrying is probably a relatively rare occasion, for one thing the priest of Gazul is unlikely to hang around after making the discovery so theres a small window to scry before you get caught. And frankly even if they do escape by scrying, between a Elder priest of Gazul hunting a younger Hashut cultist, I know who I'd put my money on.
Basically I think the duties they're going to be used in are Hold Defense, and Wilderness Survival. And the most useful Hashut counter would probably be a rune of lie detection.
I disagree with your assertion that scrying would be involved in the typical deployment.
