The Ring of the Ghosts is a magical ring from the game Venetica. The ring automatically regenerates Mental Energy over time, much more quickly than normal. This item is only available to Scarlett if she is a member of the Net of the Mask guild. She gets this item from Benedict at the Gateway Idol statue secretly hidden in the Net of the Mask guildhall, part of the Victor's Secret quest.
The Ring of the Ghosts works passively. Scarlett doesn't have to invoke it. It functions automatically as long as it is in her inventory.
The ring can also be sold for 5000 ducats.