Kyros saw only a strange flashing light. The power of Time Surge that he released from Calaminus caused a strange ripple that brought in new power.
Kyros felt the cores shaking and sensed the same power somewhere at the bottom.
"That freakin' Fate!" Kyros realized what had happened. Their battle somehow led them to a region directly above the secret underground chamber where the actual body of the Okto-Khefali was.
The attack that was at the levels of Crowns had occurred at the very top.
The Divine Wall did not allow the force energy to go through it. The impact of the attack created a massive fissure on the ground and weakened the integrity of the caves. All of this caused the crack at a strange seal hidden at the bottom. This was the secret seal where the Okto-Khefali laid.