Secor practically slept with one eye open. At any moment, the Goddess might strike. Circulating his mana into the air when he sleeps, he would be woken up if a single mite got within his range. An unguarded moment might lead to certain death. Like a tower defense game, and only his consciousness to protect himself. Of course, he began training his mana as well. He couldn't stay as weak as he is while the Goddess was slowly gaining power. Making sure to only train at the bare minimum to gain process, he doesn't want a single weakened moment. This went on for a month, until-
A silent attack aimed towards Secor's heart. The Goddess moved slowly. She had tested his defense before, he woke up and defended in nano-seconds. This time however, she moved at a pace a sleeping snail couldn't hope to match. An inch every hour. It slowly penetrated his sensor, the Goddess skillfully weaving the mana away from her. Hundreds of mana strands every millimeter. She has to move each and every one away with impossible precision to continue. He might be a genius, but she was a Primordial Goddess, an enemy the First Demon King could barely match. Even with her power deteriorated and all but gone, her mana control was delicate.
"Almost…. There!" Just a few more minutes.
"Ahhbbababaaaba." Clara groaned in her sleep.
"No. Nononono" the Goddess slowly cursed in her head. Trying to speed it up as much as she could, she continued manipulating his mana strands.
"Ahhhh. Pah!" Clara suddenly turned around, fists flailing. With a satisfying smack, Secor was woken up.
"I won't let my efforts go to waste!" The Goddess swung down. The small dagger transformed into an enormous Buster Sword as Secor brought up his shield. A loud CLANG could be heard throughout the village. Within a half second, the struggle stopped. The mana shield slowly crumbled as the Goddess faded out once again. But this time, with a victory. A large gash across Secor's chest and stomach. With the loud noise already alerting the villagers, they rushed to the church.
"Oh-oh Goddess…" the bleeding wound glowed a faint purple, symbol of a demonic being hurt. This, she thought, would be enough to prove Secor a Demon. Of course, the villagers didn't know this. Taediosus Town has been shielded from any actual dangers since the First Demon Lord. No hostile entities were allowed entry. However, that shield became a weakness. After it was shattered, they didn't know how to defend themselves, and most of them were naïve like a child. Therefore, when they wound glowed purple, they thought a demon attacked the hero. "But that was no matter,'' thought the Goddess. "The wound was injected with enough holy power to kill. He couldn't survive this."
Back to Secor, he was slowly dying. Bandages, potions, medicinal herbs, and none of them considered the glowing rock inside of him the culprit. The priest channeled more holy mana, hurting Secor even more. He passed out, unable to do anything.
Holy and demonic mana clashed like waves on a rocky beach. Unstoppable force against immovable object. Normally, they would've just come together and slowly subtract each other's powers. That's only apples when the victim is weak to the other type. However, Secor had a body that's half holy and demonic. His body, while accidentally, was handmade by a Goddess, successfully sealing away half of his demonic powers. But, the lack of holy power used made it so that he could regain that power. His body got stronger, for everything made by the Goddess is to kill the demon king, allowing him to take in double the mana of what he could in the past. But that new change could only hold holy powers. Meaning he is resistant to both powers, and can use them both. He undoubtedly would have the power to crush the world under his foot. But, in the adorable form of a baby, no one was aware of this danger.