Vicious Mockery

Cantrip (enchantment; arcane, attack, psychic)
Class(es): Bard
Casting Time: 1 Action
Range: Medium (60 feet)
Target: One creature
Components: V
Duration: Instantaneous
Saving Throw: Wisdom negates

You verbally insult or mock the target so viciously that its mind is seared. As long as the target hears you (understanding your words is not required) it takes 1d6 psychic damage and has disadvantage on the first attack roll it makes before the end of its next turn. 

The spell’s damage increases by 1d6 when you reach 5th level (2d6).