Sekiro Surgeon's Bloody Letter is an item players can obtain in the game. Here is where they can find it.
Don’t let a single scoundrel escape. Lord Juzou’s orders. pic.twitter.com/pDlvLhgbpD— Sekiro™: Shadows Die Twice (@sekirothegame) March 20, 2019
Sekiro Surgeon's Bloody Letter: Where to Find the Letter
In order to obtain the Surgeon's Bloody Letter, players will need to head into the Abandoned Dungeon. The Abandoned Dungeon is being used by the servants of Ashina to conduct "unholy experiments," and it can be accessed by either the Ashina Reservoir or Ashina Castle.
Inside the Abandoned Dungeon, players will get the Surgeon's Bloody Letter from Doujun, a physician.