It had been some time since Bai Xiaochun performed a fifteenfold spirit enhancement on his nascent soul, breaking through to the mid Nascent Soul stage. Fearful of pushing things too far, he hadn't dared to go any further than that. Considering that his name was listed on the Hell-Emperor Stele, everyone in the world would have known if he performed even a single more enhancement.
Later on, as he came to acquire everything from sixteen- to nineteen-colored flame, he had been forced to do nothing more than look at the product of his hand. He hadn't dared to enhance his nascent soul, at least not until he found the right opportunity.
His original plan had been to wait until he could advance directly into becoming a deva. But now... it was a moment of deadly crisis, and there was no time for lengthy consideration about the consequences.
