Eldritch Blade

The blade of your pact weapon convulses and is replaced with a crackling beam of force energy.

As part of the action used to cast this spell, you must make a melee attack with your pact weapon against one creature within the spell's range, otherwise the spell fails.
On a hit,  instead of normal damage, the target takes 1d10 force damage. This spell is affected by any Eldritch Invocations that can alter Eldritch Blast.

The spell grows in power and reach when you obtain higher levels: at 5th level, you can have this attack hit up to two creatures in range, three creatures at 11th level, and four creatures at 17th level. Make a separate attack roll for each target.