Netflix beat them to the punch with The Witcher. People will point to Sanderson’s works, but they just aren’t as conducive to adaptation like The Witcher is, mostly because of the scope and amount of special effects that would be required to adapt anything by Sanderson. Witcher is much more grounded, similar in it’s…

Jon is Lightbringer. Rhaegar stabbed Lyanna with his “sword” and she died resulting in forging (birthing) Jon, who goes on to become the weapon to fight against the undead, which he’s been doing since season 1.