Gemstones

They say Quartz possesses some magical properties that could amplify magical abilities, which some may consider unnatural. Well, that's what we humans believe in any way. But these days, gemstones such as this are kept as momentous from those who have passed from the mortal realm to the realm of the dead. And for the story of our protagonist, she found herself in a domain similar to ours and yet filled with magic, but her body remains a mystery, and her soul is trapped in a single gemstone in a cavern below the surface of those who walked above.