The Allagan Empire was a powerful civilization in the world of Eorzea, known for its advanced technology and magic. It thrived during the Age of the Allag, reaching its peak around 5,000 years ago. The empire was renowned for its impressive structures, such as the Crystal Tower, and its mastery of aetherial manipulation, which allowed them to harness energy in ways that surpassed other cultures. However, the Allagan Empire eventually fell into decline due to internal strife and the misuse of its technology. The empire's legacy remains significant, influencing various factions and events in Final Fantasy XIV. Ruins of their once-great cities can still be found throughout Eorzea, serving as a reminder of their former glory.