How do you play The Necrobinder in Slay the Spire 2? In an effort to stop the monsters from emerging from the Spire and spilling into The Capital, 12 explorers set out on an expedition to save their town. Though they never made it home, two of them gave birth to a child inside the Spire. After encountering a forbidden grimoire that changed her life forever, that child became known as The Necrobinder. Fighting alongside her trusty companion, Osty, The Necrobinder is one of the new Slay the Spire 2 characters to climb the cursed structure. She may have the lowest health among the cast in the card game, but don't let that deter you from learning how to play this supernatural being. The best Necrobinder builds offer a range of playstyles, utilizing Souls to transform Osty into a killing machine and inflicting Doom upon everyone in sight.