What does the curse do to the skull?

Question

There were effects. If he has less than one full Red Heart, he will be sent to a random room. The teleportation takes place at half a heart or less left.

Hagrid P Hazard · Accepted Answer

There were effects. If he has less than one full Red Heart, he will be sent to a random room. The teleportation takes place at half a heart or less left.

What does the curse do to the skull?

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