Frozen Enemies:
When you freeze an enemy it cannot be damaged right away, and any physical attack will break the freeze without dealing any damage, but will leave the enemy stunned and vulnerable to the rest of any combo attack.
Power Combos
Use two or three quick attacks and then a slow attack to do a combo. If you wish tooo add more power to the combo you can hold down the slow attack button while you deal the first few quick attacks, effectively charging the final slow attack for massive damage.
Unlock Metal Age Arena
To unlock the Metal Age arena in Versus mode, win 100 arena battles.
Replenish Magic
Crystals scattered in the various battle arenas protrude from the ground, and standing next to them will replenish your character's magic. The crystals vary in color, correlating to the four elements--they'll replenish anyone's magic, but characters with a matching element will replenish faster.
Unlock Gods
Unlock the God version of the associated Demi-God by finishing the Demi-God's campaign. Gods rank as Overlords and have the same abilities as Demi-Gods, however they fly (instead of walk), they have more life, and they cost 50% more to purchase in the Army Builder.
Unlock Elephant Pool Arena
To unlock the Elephant Pool arena in Versus mode, win 20 team battles.