Chron, the God of Time and Wisdom.
Choosing this religion will allow you to summon Colossa to your side in battle.

This "Heavy Weight" of Forms instills fear in the hearts of all whom view it.
It has the most Health of all the forms (300) and the highest Defensive capabilities (99), making this Form ideal for defensive purposes.
Although it's offense is the lowest (40) coupled with it's low attacks (25), the Colossa can best any other form on the field of battle every time as it turns away blow after blow while it chips away at it's opponent.
Also, due to their incredible size (500), Any Lessers or Forms lucky enough to be fighting alongside it take very few hits while dealing out much pain to your enemies.

The downside to the Colossa is it's cost.
275 Fury is needed to merely conjure one of the beasts, and another 60 Fury to fully Fuel it! For that cost, you could summon and fully fuel 3 Magma Demons, although the Colossa would crush all three beneath its stoney bulk.

The Colossa can turn battles, and if you've the Fury for it, there is no other option for raw power.
A Colossa teamed with Lessers &/or almost any other form (save for the Iron Hulk, due to it's low attack/offensive capabilities) is absolutely lethal.
Be extremely wary of such a team if you see them heading your way!