I am making a base class based off of Jim Butcher's story series "Codex Alera". The class will similar to the Dusk Blade class in that it can get into melee but have a handful of spell-like abilities based of the element they choose. They will also be able to summon said "fury" out and fight for you.

What I need help is finding two elementals to round out the class. I have the base four but I have nothing for Wood and Metal. Anything in a monster manual or obscure book that would help me in that regard?