Final Fantasy XI Online: Wings of the Goddess

Cavernous maws begin appearing across Vana'diel without warning. When an adventurer steps into one, it pulls them twenty years into the past, directly into the Crystal War — the conflict between the beastmen and the Allied Forces of the three great nations. After completing missions as an enlisted soldier, the adventurer makes contact with Cait Sith, a regal feline figure who carries a prophecy about a Harbinger and a champion. She asks the adventurer to help end the war.