Sekiro: Shadows Die Twice · Prosthetic Tool
Finger Whistle
A Prosthetic Tool created by fitting a slender finger to the Prosthetic; Mountain Echo and Malcontent are listed as upgrades.
How it works
The source describes the Finger Whistle as a tool made by fitting a slender finger to the Prosthetic. Mountain Echo and Malcontent appear as its upgrades; the passages do not state their separate effects or give details about how the base tool is used. The upgrade page also lists these names in its tier table.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.