Vengance

The user casts the shadow of Vengance on any willing creature, within 20ft. Unwilling creatures must make a WIS 14 Save or take the full effect.

Affected creatures get a +1 bonus To Hit, for the spell's duration. Any affected creature damaged during the spell's duration, adds +1d4 damage to Eldrich Blast (for each time damage is dealt). This ability stacks, until the spell ends or Eldrich Blast is cast.