Dongfang Shitian and his group had naturally obtained some Spirit Artifact Tier Advancement Spirit Fragments by completing the seventh phase of the Hell Trial. In addition, killing Ancient Demon God-level bosses could also yield some. It was entirely possible for them to synthesize complete spirits and then upgrade their spirit artifacts into national weapons.
Furthermore, Dongfang Shitian and his group had certainly used multiple National Weapon Spirits, which would further improve their equipment.
As for Ye Luo, although he had also used one National Weapon Spirit, he had deliberately let Breaking Waves Riding Wind, Ban Ye Shu, and the others use National Weapon Spirits afterward so they would have a better chance of completing the sixth phase of the Hell Trial. The number of National Weapon Spirits he had used certainly could not compare to Dongfang Shitian and his group.
Dongfang Shitian and his group had used more National Weapon Spirits and Spirit Artifact Tier Advancement Spirits to raise the tiers of their spirit artifacts. This would narrow the gap between their equipment and Ye Luo's. For Ye Luo to maintain his equipment advantage, he naturally needed to use Spirit Artifact Tier Advancement Spirits, perhaps even more than one.
If Yan Hua Yi Leng had not needed to upgrade the Flying Snow Wings once again to ensure she could complete the sixth phase of the Hell Trial without fail, Breaking Waves Riding Wind would have suggested giving Ye Luo every Spirit Artifact Tier Advancement Spirit obtained afterward.
After considering this, Ye Luo also realized that his equipment advantage over Dongfang Shitian and the others had shrunk considerably. He understood even better how important it was to maintain that advantage, so he did not refuse this time. Of course, that was on the condition that another Spirit Artifact Tier Advancement Spirit