You defeated the 5th Dragon Lord Tiamat in battle.

Tiamat was the last to ascend to Dragon Lord. That's why she was driven by an immense thirst for power.

For the same reason, she cursed the twelve Lords and the Daevas and always fought right on the front line.

It's now a thing of the past.

But we must never forget the battle against 5th Dragon Lord Tiamat.

You used the Orb of Remorse to get to Tiamat's Hideout and you gained experience fighting the 5th Dragon Lord Tiamat.