The White Flame was called Universe Essence Flame by the Domineering God Crystal.
This flame was created by the Domineering God Crystal with the aura and energy of the devil, Chaos Energy, a small portion of the Universe's Source that it had devoured from Ye Xiao's universe a long time ago, and its very own essence.
This flame could grow stronger along with Ye Xiao's universe. It has the ability to immediately devour Chaos Energy and life essence, and erode everything in the world. In fact, this White Flame could do much more thing than Ye Xiao currently knows. Even the Domineering God Crystal could not describe everything about this flame.
It was a unique flame, the only one of its kind.
As a result, even the all-powerful devil was unable to withstand this flame and had to cut off his own hand.