Cain came to that conclusion and did not waste time figuring out how much Merit he would need to improve since the Rebirth Mark was beyond his current realm of understanding. He unleashed his Ego Wave and flooded all the treasures in the ceiling, obtaining a detailed description to add them to the Ouroboros System's rewards.
Cain spent the next three weeks focusing solely on the Wave Virus. He would only break his concentration to rest once a week when it was time to send the corpses of the Insect Army into the Samsara Flame, obtaining Gifts for the Ouroboros System and Merit for his Rebirth Mark.
Thanks to the sea of Merit he obtained through those weekly sacrifices, the Rebirth Mark had significantly advanced, now covering his entire right arm and chest and crossing into his left forearm. Cain felt he was getting closer to the breakthrough, and his heart was full of excitement.
