Stone Warden and resistance penetration

[visage]

Stone Warden's damage types are all over the place -- Physical, Arcane, Nature, and a touch of Fire. The class's only inherent source of resistance penetration is Crystalline Focus for physical, and unless you're going for a heavily caster-focused build it really seems like that's the primary thing you'd be getting for investing the category point in Stone.

Now that Tarrasca's gone and blocking is a viable augmentation to a Stone Warden's defenses, is Plate of the Blackened Mind essentially mandatory for this class to play on Insane? (Assuming PotBM's Dominate checks the user's mindpower, I expect it's much less useful on Madness given the high mindsaves there.) Is there another reasonable option for Stone Wardens to get a solid amount of resistance penetration in more than one element?

[Snarvid]

Well, it depends on what you consider reasonable, but if you invest heavily in it Deeprock form gives 24% ish damage bonus and 15% ish respen in your three main elements. Drem can snag pretty good uptime on it - 15/25 if only using off Frenzy with max Frenzy investement, 16/23 if max Frenzy with Adept, or initially 30/45 without additional Frenzy investment or Adept and reapplying as soon as it drops.

[Pisastrish]

Would temporal form viable? The uptime isn't great, but it also gives you an anomaly that reduces resistances for 8 turns

[helminthauge]

I dont know why you're talking about armor selection under this topic. I mean even if you're wearing robes you're still only getting physical penetration from egos (though a lot of it).
Nature and arcane penetrations are very rare on egos. Nature penetration only appears on a single mindstar ego, and arcane a single cloak ego. So I guess you just use normal attacks against anything with high resists.

[Snarvid]

Tarrasca used to be automatic best-in-slot for Stone Wardens due to the Earthen Vines tree slowing your movement by 50% and Tarrasca giving you resist all = any slowed movement factor. Now that Earthen Vines no longer slows the armor slot can consider other contenders.