The sealing of the passage from the First Valley did not impede Lord Evelion's breakthrough. She already accumulated the sufficient worldly dark element energy and the passage itself was constructed in a peculiar way to support Nature's invasion of the Second Valley. Breaking it down to its components make it a treasure trove with quite enough resources for a handful of Third Cycles to breakthrough to the Fourth Cycle.
In contrast, the situation just got worse for Cortex Erga and Cortex Faruk Maindoch. With the passage sealed, moreover by Nature, they could not dream of returning to the First Valley the way they came. The options left for them were to escape to the Void or the Second Valley, preferably the former. The crux of the matter was escaping before the passage’s total destruction
