If Leonel was correct, then the reason this was only a temporary solution was that his control wasn't there yet.
The ability he had awakened was so powerful that it wasn't yet his place to truly control them. It could be said that he was only strong enough to give it a temporary patch.
However, the main probably should just be using both of them at the same time. That wasn't something that he did too rarely, but it also wasn't something that his entire battle style relied on. So long as he avoided it, he shouldn't end up in the same situation again.
Regardless, this should mostly be a good thing. Whatever breakthrough he had had just now, even if it caused problems in the future, would only help him.
Eventually, Leonel had enough strength to get up and Aina finally allowed him to do so as well. Then, he made his way to the Godlens. He had some questions.
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