Ultima

In Final Fantasy Tactics Advance, each of the five Crystals in Ivalice has a guardian known as Totema. Once the guardian is defeated and the crystal  is broken, the player can summon the Totema. Each race can only summon a specific Totema and Ultima is the Nu Mou's Totema. The resemblance Ultima shares with the summoned beast in the FF12 trailer are almost exact. Soaring high above the planet, the summoned beast uncovers a giant canon under its dress. A close-up reveals the face of a beautiful woman. As it awakens, energy is gathered near the tip of the canon and powerful beam is shot towards the planet.