Remembrance of Rykard, Lord of Blasphemy, hewn into the Erdtree.
The power of its namesake can be unlocked by the Finger Reader. Alternatively, it can be used to gain a bounty of runes.
Rykard took the form of a giant serpent that he might devour, grow, and live eternally. "I understand. The road of blasphemy is long and perilous. Once cannot walk it unprepared to sin."
While Remembrances can be duplicated more than once through different Wandering Mausoleums, they can't be traded for a copy of an already obtained item in the same playthrough.