Spite

2nd-level abjuration
Casting time: 1 action
Range: Self
Target:
Components: S
Duration: 1 hour
Classes: Bard, Sorcerer, Wizard
Subclasses:

You prick your finger and anoint your forehead with your own blood, taking 1 piercing damage and warding yourself against hostile attacks. The first time a creature hits you with an attack during this spell’s duration, it takes 3d6 psychic damage. Then the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.