Isshin's Letter is a Key Item in Sekiro: Shadows Die Twice. This lore note reveals a relationship between Isshin Ashina and Emma.
Isshin's Letter Usage
How to Find Isshin's Letter
- Found in Ashina Castle. From Upper Tower - Ashina Dojo Idol, go downstairs and left, defeat two samurai and slice the door behind them. A passage leads to 3 Tengu enemies. Defeat them and go upstairs to find the letter.
Isshin's Letter Notes & Tips
- Appears to only exist to give the player additional insight into Isshin and Emma's connection (and Isshin's activities as the Tengu of Ashina). Cannot be given to Emma and her dialogue does not change after acquiring it.