Your create a gnawing thought that grows in your target's mind until it becomes strong enough to kill them. A creature you can see must make a Wisdom save or be afflicted by the spell's devious effect. On a successful save the spell ends, and the target suffers no ill effects. On a failed save the creature is unable to concentrate on spells, cannot maintain rage, battle song, and suffers disadvantage on all spell attacks they make until the spell ends.
While the spell is active the caster may spend an action to make the target repeat their wisdom save. On a successful save the spell ends without any ill effects. If the creature fails, then mind worm gains 1d10 of potential damage. Once the spell has gained a single potential damage die you may use a bonus action to trigger the spell to end. All the potential damage dice are then rolled, and the target suffers psychic damage equal to the number rolled. A creature that successfully saves while the spell has potential damage dice will still take damage, but only half the amount rolled.
If you lose concentration, or the spell ends without being triggered the target will take no damage and all accrued dice are lost.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the number of dice accrued for each failed save goes up by 1 for each slot level above 3rd.
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