For Duncan, the "Great Obliteration" had finally ceased to be a completely unknown mystery. Deep within the ancient, massive curtain, the truth at last unveiled a corner to him—the most crucial corner.
It was the "collision" between worlds that had caused the Great Obliteration. The "incompatibility" of different worlds warped the remnants of the collision into the bizarre and perilous Deep Sea Era we see today. The scene lingering in the deepest nightmares of Silantis was a microcosm of that collision.
But it was just a microcosm—the worlds involved in the collision were not limited to just those two.
Duncan could feel that, as he "understood" these truths, some changes were taking place within himself.