The flaming monster was a pure fire elemental monster, so Li Huo talisman, which was the one he used to injure a tentacle monster wouldn't do much damage to it. He had gone through the entire ancient book trying to find as many options as he could. In the end, he decided to select one ice elemental talisman.
There were many types of level-three talismans, but the number of talismans he could understand wasn't that many, so, in the end, he selected an ice elemental talisman called Bing Beng Fu (TL: Glacier Talisman). He did not think it was the most powerful talisman in the book, because its description was the shortest, and the method of making it was the simplest. But he could make many of them to compensate for its weak power. He did not know how many flaming monsters were there in each section, but he needed to prepare at least nine Glacier talismans.