With the defeat of the last dregs of the Dark World denizens the World of Elements finally became rid of the threat of invasion.
If in the future an Invasive World once again punches a hole in this world's space to create a Portal, the denizens were already equipped to push them away.
But if they invaded by traveling using a Space Vessel, that would be something inevitable.
The World's Will would surely bar their way from entering. However, Ele or any other World's Will's strength isn't absolute.
They also grow alongside their denizens and they're beings without any Physical Bodies. Despite having the ability to create an Incarnation through the world's Source Energy, it was at the expense of their own 'Essence'.
Well, I'll call it Essence, for now, to refer to the existence of these World's Wills.
At the moment, my consciousness was once again summoned by Ele.