Black Knifeprint is a Key in Elden Ring.
On the Night of the Black Knives, someone stole a fragment of Death from Maliketh, the Black Blade, and imbued its power into the assassins’ daggers.
This mark is evidence of the ritual, and hides the truth of the conspiracy.
Elden Ring in-game description
Black Knifeprint Location

Additional Insights Into Black Knifeprint
- Effect: Mark of the Night of the Black Knives ritual
- Rarity: Rare
- Sell Value: 0 Runes
- Black Knifeprint can be traded.
- On-Hand Capacity: 1
- Storage Capacity: 1