Analog Addiction Writes: "The Basics
God of War: Ascension is the first God of War game to offer any competitive online experience, although Kratos won't be playable in the multiplayer portion. It definitely mirrors the God of War gameplay we have come to expect.
Choosing A God
When you first start multiplayer you will be ask to align your character with 1 of 4 Gods, which can be changed if at any point your character returns to the area. Within the Beta we were allowed access to only two of the Gods: Ares, who gave your character boosts in melee damage and other strength focused abilities, and Zeus who improved elemental damage and gave players magical abilities. The other two Gods available are Hades and Poseidon, though their abilities were not shown during the Beta."