Diviner's Bane

A bolt of psionic energy reaches toward a creature you can see within range. The creature must succeed on a Wisdom saving throw, taking 5d8 psychic damage on a failed save, or half as much damage on a successful one. On a successful save, the spell ends for that creature.

For the duration, the caster is granted insight into the mind of the target, making their attacks against them harder to avoid, and their movements harder to predict. The target has disadvantage on all attack rolls against the caster, as well as saving throws made as a result of the caster's actions, and the caster has advantage on all attack rolls against the target, and advantage on all the saves it must make as a result of the target's actions. In addition, each time the target misses the caster with an attack, they must make a Wisdom save, taking 5d8 psychic damage on a failed save, or half as much damage on a successful one.

When this spell is cast, an abnormally large third eye appears on the head of the caster and remains there for the duration.