The 'House of the Dragon' season 2 finale introduces a mysterious new character. Here's who Brynden Rivers AKA Lord Bloodraven is and what happens to him in the books.

• The "House of the Dragon" season two finale briefly introduces a mysterious new character.
• Brynden Rivers, also known as Lord Bloodraven, appears to Daemon Targaryen (Matt Smith).
• Here's why he's important to the "Game of Thrones" franchise.

Warning: Major spoilers ahead for "House of the Dragon" season two, episode eight.