Go to the Esoterrace to learn the background behind Tiamat’s Sword.
Step 1. Find the Storage Sphere of Surama in the Esoterrace Secret LaboratorySurama’s secret laboratory beneath the Esterrace. It connects to the Air Conditioning Room by a Secret Passage..
Step 2. Talk to RelytA Pandaemonium Expeditionary Force centurion at the Gelkmaros Fortress..
Step 3. Talk to LuigirA Pandaemonium Expeditionary Force Archon dispatched to Gelkmaros Defense Base..