The Lord of Darkness can freely enter and exit within his sensory range, moving at will.
Thus, although he had retreated deep into Purgatory, the Master of Devouring dared not act recklessly.
To be safe, it is best to take action at a location forty thousand miles away from Purgatory, as only this distance can evade the detection of his 'brother'.
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Upon entering the Cloud Palace, the moment Lin Rui sensed the Root aura, he opened his 'Separation and Union' technique to the maximum, dispersing and aggregating the surrounding Root aura to repel it far away.
This substance is akin to a toxin for the Abyss, accelerating their descent into the Root; it was almost the same for Lin Rui.
The previous 'Abyss Divine Tablet', though originating from the Root, was a solidified entity, whereas these Root auras were scattered and active.