Compatible with Earlier Books
Use What You’ve Got
Except for the original core book and the first edition GM Screen, books published for first edition 13th Age are entirely compatible with the revised rules, monsters, magic items, and classes in 13th Age 2E.
Mix and Match from Any Book
Run a new party through Elven Towers or the Eyes of the Stone Thief! Add a monk or necromancer from 13 True Ways to the party, or maybe a demonologist from Book of Demons! Then hit them with the Great Ghoul from 13th Age Bestiary 2. . . .
(ROB SAYS: This is all true. There are some changes to conditions that we think make them work better in the game, but they won’t dramatically change how monster abilities and PC powers, talents, and spells that use those conditions operate. We’ve revised true magic items so they get better and unlock new abilities as their wielders level up. Also, GMs might want to double-check the Building Battles sections in individual adventures to match the improved chart in 2E.)