Anund told you about the Sky Temple of Arkanis. Agnita, the Daeva of the Blaze, had been imprisoned there. You were then referred to Bulagan. Bulagan explained that you would need to find the key to the Fire Temple first as Agnita had been imprisoned in the Fire Temple. You crossed the Water Room, the Wind Room and the Fire Room, and found three keys. After you gave Bulagan the three keys, he imbued you with the power of the Flame Key. You reported to Gangleri, who was glad that Agnita could now be rescued.