Synaptic Static

Level: 5th
School: Enchantment
Casting Time: 1 action
Range: 120 feet
Components: V, S
Duration: Instantaneous

Description:

You choose a point within range and cause psychic energy to explode there. Each creature in a 20-foot-radius sphere centered on that point must make an Intelligence saving throw. A creature with an Intelligence score of 2 or lower can’t be affected by this spell.

A target takes 8d6 psychic damage on a failed save, or half as much damage on a successful one.

After a failed save, a target has muddled thoughts for 1 minute. During that time, it rolls a d6 and subtracts the number rolled from all its attack rolls and ability checks, as well as its Constitution saving throws to maintain concentration. The target can make an Intelligence saving throw at the end of each of its turns, ending the effect on itself on a success.

Notes:

• Area of Effect: 20-foot-radius sphere.
• Psychic Damage: A powerful damage type that is rarely resisted.
• Debuff: On a failed save, targets suffer a significant penalty to attacks, checks, and concentration saves.
• Intelligence Save: Targets must make an Intelligence saving throw, which is often a weaker save for many creatures.

Source: Xanathar's Guide to Everything