I am still not sure what I will be playing in Giantslayer. Now I stumbled across the arctic domain (animal and terrain domains).
It allows you to use command cold subtype creatures (as command undead) and to turn fire subtype creatures (as turn undead).
We will probably be running this as an all dwarf game. So my Cha mod (for the save DC) will be low.
Frost giants have the cold subtype and fire giants have the fire subtype. But I do not know how many of those one encounters. And whether there are other creatures with the appropriate subtypes.
Notice that you're only capable of commanding a number of Hit Dice of critters equal to your level. Since frost giants have 14 HD, you're unlikely to get command of even one of them until pretty close to the end game. There's some other monsters with the cold subtype, but it's still not a super-optimal idea.
Good point. I did not remember that.