When the King of the Undead finally entered the area that was surrounded by the six iron fortresses, Lin Yun's heart suddenly pounded. The Ten Thousand Spell Wheel and the Magic Array, which were functioning at full speed, finally caught something usual.
Earlier, despite all the attacks he faced, the King of the Undead's pace and the length of his every stride had never changed. None of his other body parts changed, either, because those spells didn't work on the King of the Undead at all.
His pace never changed, even though the spells that hit him were more powerful. He moved, not to be stopped or even disturbed by anyone.
However, there was a tiny, almost unnoticeable change in him. Lin Yun couldn't have spotted the change if the Ten Thousand Spell Wheel and the Magic Array hadn't been functioning at full speed.
The moment he spotted the change, Lin Yun unhesitatingly swallowed the potion he had made.