Concept.
It was something that went beyond the simple energies any of us used. A concept was just like the name entailed, a very core of the world itself. An idea, and ability so primordial that none could control it.
The Outer Gods were just the manipulators of concepts, the gatekeepers. They had no control over the gate itself.
But that made them all the more tricky. Since what one was trapped behind was the gate and not the gate keeper. To 'defeat' an Outer God, one had to counter the concept that it contained.
When the Invasion Navy was faced with an enemy it couldn't hope to penetrate through, it lost its being.
The same was the case with the other Outer Gods.
The Outer God suddenly scrunched its face, opening the first seal seemed to have had an effect.
That which was playing with its prey all this time had suddenly changed its air into one of battle.
It's face like a ball tied into a giant sheet slowly opened up with a new mouth.
[You… you seem powerful]
It said.