This was one of Charles 'quirks. He always said something when he released magic.
In fact, there was no need to chant the magic at the beginning. As long as one believed in the corresponding elemental god in their heart, they could rely on their own spiritual power to release the magic.
Because of this quirk, Charles had been ridiculed by many people before he ignited the divine fire.
But later, he ignited the divine fire and became a powerful god, so his quirks were also made into the secret of making Charles so powerful by people's minds, and the world competed to imitate him.
At that time, Charles understood that when he was strong enough, he would no longer have any 'weaknesss'.
The more powerful it was, the more perfect it was.
After that, Charles " experienced " a certain future, relying on the world to imitate his eccentric behavior, making magic something that could only be released through chanting.
