A nice take on the frost Giant take. As for dimensions, I don't worry about them for fantasy, because as soon as you do, Dragons, really Giant Bugs, etc, become impossible or twisted from our intent.
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If more was added, I'd like more on their motivations and culture :)
An interesting culture, though a bad one to spring on PCs who like wearing gaudily-colored adventuring outfits. Perhaps a little bit of warning from the townfolk would be in order before the PCs set out into the wilderness. Also, the rime-fire intrigues me. Could some frost-giant blood be"harvested" and kept in a vial for later use? Would be fun to use it as an impromptu grenade . . .
I've been waiting awhile to comment on this one because I've been trying to let it grow on me. The idea is interesting -- a bit munchkin-y, to be honest -- but I can see that it would work if you had good rules for blocking with shields in your game system.
What puts me off is really its construction. These are dwarves, right? For a weapon-returning shield I would have expected a more . . . mechanical solution. Maybe something that slingshots the missile around the dwarf and back at their foe. Maybe something that uses magnetic forces. The shamanistic rock substance didn't really do it for me.
Now, I can imagine a sort of "portable portal" variant of this that might make sense (though probably not for dwarves). Instead of a rock that actually sucks the spear out of someone's hands, the shield could be a two-way portal that will simply reflect the attack back out. The enemy would still be holding onto his end of the spear, but the pointy end would now be coming at his chest. No sucking force at all, and no reason the weapon couldn't be half-out, half-in.
Just my 2c. Even if you didn't change the construction or effects of this shield in any way, it could still use some expansion.
The idea is interesting but I have trouble visualizing it. Dossta's idea of a "portable portal" is a nice twist and is easier for me to see. It is especially nasty, since all of the attacker's force is twisted back around.
This sub leaves me curious about the Skkanden. They seem more "savage" than the average Dwarf. Are they more focused on stonework than metalwork? Is their culture more tribal/animistic in nature?