Repelling Blast and Hideous Blow

[BlackStork]

Repelling Blast description confuses me abit:

Repelling Blast
Invocation Type: Greater; Eldritch Essence
Spell Level Equivalent: 6
This eldritch essence invocation allows you to change your eldritch blast into a repelling blast. Anyone failing a Reflex save is knocked down for 4 seconds.
NOTE: This blast is a point-blank area-of-effect blast centered on the caster that only affects hostiles and requires a ranged touch attack to hit.

As far as I understand it is Essense, so it should work with any Blast Shape? Will it work with Hideous Blow?

[Nemni]

No. The custom made invocations can't be combined with others.

[Argumantive]

Repelling blast is both an essense and a shape, it simply makes a RTA versus any and all enemies in it's radius, in a 360 angle, all around you.