The Target is bound to a spectral tower made of Darkness Sphere that no light can penetrate. Any creature can enter The Tower freely, but only creatures who aren't targeted by this Curse can leave it. While inside The Tower, creatures can see as if in Dim Light.

At the end of each day, each creature inside The Tower must roll a d10. The creature subtracts the rolled value from their Vitality maximum, which cannot be regained except by the use of a Wish Fulfillment Spell or taking a Long Rest outside of The Tower. If a creatures Vitality maximum is reduced to 0, they automatically die and their bodies are swallowed by the shadows that make up The Tower. This creature is revived d10 days later as a loyal thrall to the Caster, retaining all knowledge and skills they had in life.

This Curse cannot be undone by the Remove Curse Spell, and can be dispelled only by the Caster, the death of the original Target of this Curse, or by the Wish Fulfillment Spell casted outside of the spectral tower.

You stand before the spectral tower, its dark walls swallowing all light. Once inside, the dim light reveals shadows lurking. You know you cannot leave. Each day, your vitality diminishes, the tower's darkness slowly claiming you. If you die here, the shadows will consume and transform you into a thrall.