The aether spear through into the Primal's chest with one mighty attack, cutting through all layers of defense with ease before the spear blade was stuck deep in his chest. If it had only been a Pure Aether Spear without anything utilized to increase the inflicted damage, Primal Xerx's chance of survival would have been low as well, but it wouldn't have been this low.
The aether spear had inflicted a severe wound on the remaining Essence in the Primal's body, and it continued to do so while the Essence Storms of the Essences from one hundred or more gods gushed out of the spear blade. The Essence Storm entered the Primal's body and spread rapidly through him.