It would not be enough to close the fissure, as that would only be delaying the inevitable. They would have to purge the infection first before they closed the fissure shut, as unbelievable as it sounded.
Reed's role was to clean up the infection in the fissure until it was free of miasma by heading down into the built-in infrastructure of the planet that ran the Heavenly Barrier, the Michomitl.
Deep beneath the crust of the earth, laid a vast and expansive network of complex machinery that only a few people in the multiverse truly understood. It was an advanced, continent-sized machine of vast proportions. Not even Lu'um could say with complete certainty that she fully understood the means by which the Heavenly Barrier operated.