Hideous Blow

Least Invocation; 1st; Blast Shape
As a standard action, you can make a single melee attack. If you hit, the target is affected as if struck by your eldritch blast (including any eldritch essence applied to the blast). This damage is in addition to any weapon damage that you deal with your attack, although you need not deal damage with this attack to trigger the eldritch blast effect.

Source: Complete Arcane