Prerequisite: The Dark Powers patron and Eldritch Blast cantrip.
You can imbue a mundane bow with dark power, or using your Pact of the Blade feature, you can create a powerful bow of negative energy. When you wish to cast your eldritch blast cantrip, you can cast it through your bow instead, drawing back your bowstring and creating an arrow of dark arcane force. This attack can be repeated a number of times equal to the number of attacks you normally have with eldritch blast. This attack also uses your dexterity for attack and damage rolls. When you hit a creature with it, you can expend a spell slot to deal an additional 2d8 necrotic damage to the target per spell level.