Chapter 673: Chapter 673: 557: Olympiad Mathematical Theorems and the Battle of the Gods!

In the valley shrouded in the Fog of Death, the Plague Spreader, Nickru, burst out from the Space-Time Gate, flapping his wings.

As a high-ranking demon, Nickru naturally possessed legendary strength; having pledged himself to the great Overlord of the Undead, he swiftly became a ninth-realm legendary demon and acquired the powers to spread plagues and deadly poisons!

This time, in invading this new realm, he had actively volunteered to lead the vanguard, hoping to accumulate achievements and once again gain the favor of the Overlord of the Undead!