[3182] Shadow God and the Tomb of Ariel

Something has long since bothered me. We know that fully developed Nightmare Seeds spread corruption.

And we have an extreme collection of those as the entire Tomb of Ariel is made of millions of them. This should be an extreme source of corruption washing over the entire Dream Realm.

Except there seems to be the perfect containment measure in place. Two immensely powerful armies which are incorruptible and immortal, fighting an eternal battle.

Now we know that Gods can see the future. Did Shadow God foresee the future of the ToA and cursed the two hosts so they act as a prison for the Nightmare Seeds?