Daemon Targaryen has found an unlikely ally in Alys Rivers. She could be important in 'House of the Dragon' if her story follows the plot of 'Fire and Blood.'

• Alys Rivers spends most of "House of the Dragon" season two transforming Daemon's personality.
• Alys is a mysterious, potentially supernatural character in the series and the "Fire and Blood" novel.
• Here's what to know about Alys and her possible future in the series.

Warning: Spoilers ahead for "House of the Dragon" season two and for the book "Fire and Blood."