Eldritch Amplification

This spell increases the potency of you Eldritch Blasts or similar arcane missiles. When you make a ranged spell attack, the attack does an extra 1d6 Force damage, and creatures within 5 feet of the target must succeed a Dexterity saving throw or take half the spells total damage. 

At Higher Levels  When you cast spell with a spell slot higher than the 1st, the extra damage increases by 1d6.