So it turns out to be the Heart Method manifestation.
It looks terrifying.
While other Grandmasters are battling, there seem to be faint patterns beside them, appearing and disappearing, flickering slightly.
The first time Su Yue saw Li Xingpei slaying Bai Mei, he noticed a massive sword flashing above her head.
So, this is the Heart Method manifestation.
Terrifying.
Unfortunately, it can only appear once one becomes a Grandmaster.
"Go ahead, place your palm on the stone slab, and then fully activate the power of your entire Qi Blood, immersing yourself as much as possible in the Spiritual Qi within the slab.
"This is your first time cultivating, so you can enjoy the treatment of a Grandmaster; an image manifestation will appear behind you, but it will be the only time.
"At its peak, the Moon Nether True Scripture can theoretically open all your Qi points.
