All the pursuing spirits were from Elysium, and while they were all around the same power level, their geno cores were very different. Two of the king spirits were using swords. One used a feather, one wielded a knife, and another used a copper cauldron. Han Sen couldn't see what the sixth spirit was using. He simply waved his hand beneath a cloak, which dropped a thick mist across a dozen miles of landscape. It consumed everything, including Han Sen.
The radius of that fog was too wide for Han Sen to escape. While he was inside, his Dongxuan Aura was also suppressed and dampened by the mist. This made him feel uneasy.
Hallucinations could not confuse Han Sen, but this mist carried a phantom pressure with it. It weighed on Han Sen and slowed him down.
The six king spirits, each with their horrible weapons, all managed to catch up due to this.