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Bai Yan thought about it for a moment, then said, "I think I understand the reason!"

"Oh, what's the reason?" Bai Qi asked in surprise.

"The Netherworld Flame is the Phosphorous Flame in the Spirit Void Dao Tomb. This Phosphorous Flame has a very powerful Dao technique, so the stronger the user's power, the stronger the power of the Karmic Flame will be