The Well of Wounded Souls

From the introduction:

When an innocent dies with grief in their hearts, ‘tis said the soul becomes trapped in the Well of Wounded Souls. To most, the legend is regarded as a fishwives’ tale, but to those who quest after arcane power, The Well is a font of necromantic power beyond compare. If and when one discovers The Well, the intrepid adventurer finds the legends are true: black onyx walls with blood amethyst striations pulsate with an unholy arcane light as living beings walk near, causing shadows to dance at the edge of vision. A cold mist rises from the floors, though it disperses with the light from the walls.