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Despite how fast Lucifer traveled, the skies of Murim were not as easy to cross as those of Yggdrasil. Because of the sheer lack of Mana, beings born from magical worlds like Yggdrasil struggled over time if they did not learn to properly absorb Ki.
Thus, a dragon—a powerful magical being requiring vast amounts of ambient Mana like Lucifer—grew tired after a while and slowed his flight. Despite his immense strength and vast Mana reserves, he discovered his limits.
Wu Lieng and Yoomyung helped him absorb the ambient Ki instead, and Lucifer began awakening his Meridians one by one, gradually improving his ability to fly in these heavy skies. The Low Heavens were not merely clouds but endless seas of thick, condensed Heavenly Ki, exerting immense pressure on any living being flying beneath them.
