6 Fourth Wing book 4 fan theories we're almost convinced are true - Winter is Coming

Theory Briefing

• The most-traction theory in the fandom right now holds that the character Berwyn is secretly Naolin in disguise.
• Sage, a venin introduced in the first book, has been a long-running thread that fans believe ties directly to this reveal.
• Readers are pattern-matching names, dialogue, and lore details across four books to build the case before book four drops.
• The theory's appeal rests on dramatic irony — characters the reader trusts may have been compromised from the start.