From the Kickstarter: [T]he biggest, most exciting expansion ever made for DnD 5th edition. Bring your next character to life with 10 new base classes and 150+ subclasses, and fill their spellbook with 130+ new spells. Use new races and brand new customization options to make your character completely unique. Bring new adventures to your table and reinvigorate your love of 5E with Spire of Secrets.