A Large Mnemosyne
From Drunkapedia
Obtained by: Pretty much all upper all upper level Undead can drop these
Stack Size: Does not Stack
Mnemosynes can be handed in to the Undead Hunters in Tufa for some special items or the undead NPCs outside Samsur for a small amount of experience. They can be handed in as is or they can be unlocked using Obsidian Keys carved from Obsidian Hearts. Unlocked Mnemosynes yield a greater reward (more items/more experience).