Rumble!
The self-detonation of just a single Netherworld giant was enough to terrify the Blazing Fire Giant and the Black Mist ancestors, to say nothing of the many fallen giants and Ying Bu and the other cultivators of the Nether Sea.
With so many people self-detonating simultaneously, in the span of a single instant, the Nether Sea that had existed until a moment ago was blasted to dust, and even the very space where the Nether Sea resided collapsed into nothingness.
Chapter 769