Crank, God of Ages Past.
Choosing this religion will allow you to summon Iron Hulks to your side in battle.
Where I would consider demons & Woodens to be warriors & the Dragons to be the Assassins, I would Consider the Iron hulk to be the Defender of the Realm.
It has a defensive capability of 98, second only to the Colossa, but balances that awesome ability with a relatively poor offense (45).
It's ability to cross mountains increases it's mobility, however it's relatively high cost is prohibitive (248 Fury for a fully fueled Form)
The Hulk is a stayer, beating off huge armies with little more than a few scratches to show for it.
They are a great Defensive Form, and coupled with their great size (thus drawing more attacks) they are lethal when paired with Lessers or a Form with above-average attacks.
For Instance, a great combination is Demon/Hulk, the Hulk takes the damage (protecting the Demon) while the Demon dishes it out, not to mention any Lessers being upgraded by the demon.