When you were just a baby, you fell into Avernus where you were found and adopted by Tiamat herself. Despite the history surrounding her, she chose to raise you as her own even though she would constantly tell you to not call her mom.

You wake up on a regular morning (or at least you think it's morning) on a small bed Tiamat made for you. Tiamat herself is still asleep and she still towers over you since she's so massive.