Making an Inference to Create a Skill

After that, Merlin discovered the secret of the Spiritual Weapon-forging.

Cross-level forging.

If it was a Spiritual Weapon that was not on the same level of the Land of Death, only legendary-level Spiritual Weapon could be forcibly forged across levels by using a higher-level Spiritual Weapon that was at least at the high level.

Legendary Spiritual Weapons of any level weren't easy to find. Therefore, they were replaced by Spiritual Weapons with the same amount of spirit energy.

“It seems that the problem of forging a legendary-level Spiritual Weapon has been solved. If I can hunt more high-level Spirit Beasts, I will be able to forge up to six feathers.”

“A legendary-level Spiritual Weapon that has been forged six times. Its strength is considered to be the next level of the next level of the King rank spirit weapon. It's even stronger than that."

Merlin became infatuated with spirit forging. He forged all the unused level-one Spiritual Weapons into Spirit Forging Lights.