You begin to make the Target go insane.
On its first Contesting Roll it gains a Short-Term Madness Table.
Each Round when the creature fails the Soul Contesting Roll it goes more mad, gaining a Short-Term Madness Table. Every 3 fails it gains a Long-Term Madness Table, instead of a Short-Term Madness Table.
It losses one madness effect after each Long Rest.
You watch as the target's eyes widen, darting around as unseen terrors take hold. Their movements grow erratic with each passing moment. As the curse deepens, they mutter to themselves, consumed by spiraling madness that worsens with every failed resistance.