The caster causes thorns to sprout from the insides of the subject creature, which writhes in agony for 3 rounds, incapacitated and taking 6d6 points of piercing damage at the start of each of his turns, before his HP immediately hit 0, with 1 already failed Death Saving Throw. During the 3 rounds of effect, the target makes a Constitution saving throw during each of the ends of his turns, ending the above effects on a success.
However, a creature that succeeds at his Constitution saving throw is still cursed by the thorns for 1d6 extra turns. During this time, he takes 3d6 points of piercing damage at the start of each of his turns. Also, even the slightest movement inflicts terrible pain to the target – resulting in 1d4 damage for each attack or spell attempted, and 1d4 damage for every 5 feet the target moves. In addition, the moving speed of the target is halved during this time.
A Wish spell cast on a subject during this time can eliminate the thorns and completely save the creature. In this case, the thorns do not linger, ending all effects of this spell.