Drops from the two Suspicious Shadows in the Flexile Sentry boss fight room No-man's Wharf in NG+. One does not have to waste Bonfire Ascetics in order to keep spawning the Suspicious Shadows. Once the shadows have been killed and looted, the player can quit and reload the game (do not kill the Flexile Sentry boss). This will cause them to respawn in the boss room. This can be repeated.