Remembrance of the Impaler is a remembrance in Elden Ring. It comes from the Shadow of the Erdtree expansion.
Remembrance of the Impaler is the remembrance of Messmer the Impaler. It drops when the boss is defeated in the Shadow Keep. Finger Reader Enia at the Roundtable Hold trades it for a spear or an incantation. It can also be used for a large sum of runes instead.
Using it grants 40,000 runes. Trading it with Finger Reader Enia gives Spear of the Impaler or Messmer's Orb instead. Only one copy drops in each playthrough, so the choice matters.
"Remembrance of Messmer the Impaler, hewn into the Scadutree. The power of its namesake can be unlocked by the Finger Reader. Alternatively, it can be used to gain a great bounty of runes. A malevolent snake writhed within Messmer, and so his very mother plucked out his eye and put in its place a seal of grace. Yet, having done so, her fear compelled her to secret away her child within the realm of shadow. Hidden away, keeping company with the original sin, and a hatred that would not be confined."