According to the rules, they only have two months of exploration time, after which the Fire Domain opens to others.
So after Su Yu gained 51 points of the Power of Law, he didn't immediately upgrade the Qi Refining Heart Skill. The upgrade had a significant impact, so he needed to find a safe place, preferably waiting until he returned.
Next, Su Yu spent most of his time collecting Blazing Flame Spiritual Light, and whenever he ran into a Law monster by chance, he naturally took them down.
The Time Sword combined with the Great Divine Skill of Sky Splitting, along with two Tier Nine Flying Swords, could handle anything under level 200.
Though it was a one-shot strategy, it was more than enough.
Two days later, Su Yu saw joyful news in the Fire Domain's regional channel. A team formed by another group of Loose Immortals besides Shi Qing found another Demon Immortal remains. After a siege, they successfully killed it, gaining a Tier Nine Treasure and 43 points of the Power of Law.
