No matter what they say, I cannot give up on you. I know you're still out there, Sophie, captured by the heart of the Shroud. This tower is no home without you. My fingertips trace the rotting pages we swore to keep safe. Their fading words slip my mind like your memory as the mist draws near. But unlike you, I can't escape. I can never run from the things I said to you... because every time I look into the mirror, you gaze back at me, sister. When all is silent in the dead of night, I hear your cries reverberate throughout these empty halls. Maybe your ghost will return to haunt me. And perhaps I deserve that. You're my other half. A mirror image. My biggest regret, and loss. I miss you, Sophie. Come back.

Here in the moonflower's bloom My tears mirror yours As heart and casket lay bare

You found a pretty ring after defeating a Fell Banshee. There's a Gemini symbol on the inside.