But he could not call Immortals to kill Long Chen. He couldn't interfere with Destiny in that manner.
In his eyes, he was the only one who could kill Long Chen effectively. But as the Destiny didn't allow him to harm a mortal, he couldn't do that either.
No matter how Long Chen was or what his affiliation with destiny was. The truth was that he was still a mortal.
He couldn't hurt a mortal. The only way he could hurt a mortal was if the Mortal was entirely swallowed by Darkness.
Since Long Chen had the Law of Darkness, it was easy for him to be swallowed by Darkness. That's why he planned all this.
His partner had tried to use the same plan previously when he tried to put Long Chen's family in danger by telling the Major Sects about Long Chen killing their disciple.
That was what led Long Chen to use the Dark Sacrifice. Unfortunately, that much darkness wasn't enough. And Long Chen wasn't attacked by them personally.
