Because as soon as he came out of the first Secret Realm, he would have to go to the second one the next day, leaving him no time to make further preparations.
The reason Li Zhirui chose the Five-colored Secret Realm and the Thousand Islands Secret Realm was, firstly, because the former contains pure Essence of the Five Elements, which could accelerate the growth of the Five Viscera Gods.
He had been nurturing and strengthening the Five Viscera Gods for years, and they had already matured. Yet it seemed as if there were no limits to their growth, and they could continue to be cultivated.
Now with such an excellent opportunity, Li Zhirui naturally didn't want to miss out, as this was the Essence of the Five Elements at its richest. If he could obtain it, who knew how many years of cultivation it could save him?
