Tools out of bone and stone...giant bones? Bones of their ancestors? Their size makes me think they might use mammoth bones or other large creatures you mentioned but I wonder if using their own people's bones might make it more interesting. Could be an interesting concept for a creation of weapons too if they could get a hold of some bones.
As it stands, its a good start, but a little more in the line of how they might be expected to behave when you interact with them would be good. What do they generally think of the little men? Will they strike you down for bearing a torch or having a campfire? Do they make merry at their camps when you encounter them, or are they a dour bunch?
Also, to Muro's comment: We expect that a creature five times taller, five times thicker, and five times wider than a natural human should weigh not five times what a man does but 125 times his weight. At six foot, a human is 'supposed' to weigh about 165 pounds, so we expect a 30 foot giant to weigh about ten and a half tons.
Rather than painting a picture, it throws up questions.
As for their dimensions, they'd have to be disproportionately thicker than a simply enlarged human, as strength of bone increases with its cross-sectional area, but the burden placed upon it with the volume of flesh. Hence, why elephants are so stocky.
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?