Dragonborn - The Secrets of the Skaal

Once you finish the Gardner of Men Quest Miraak send the Dragon, Krosulhah to defeat you. Kill the dragon and then travel to the Skaal village and speak to Storn.

Even though the Skaal have been keeping the secrets away from Hermaeus Mora for years, Storn will agree to your request,give him the book and follow him to the center of town, where he will read it.

Hermaeus Mora will kill Storn during the process of absorbing the secrets, but in return for his death, you will be taught the final word of Bend Will.

Once you have the final Word you can now face Miraak.