After all, Zong Shen still knew too little about the deeper details of the Blood-Burning Demons.
But judging from the current situation, the Blood-Burning Demons undoubtedly had a fairly deep cooperative relationship with the Undead of some plane.
After all, demons and the undead spirits of the Undead truly complemented each other in many ways.
The Undead themselves also possessed the trait of growing stronger through war.
Other races inevitably suffered losses when waging war.
Only the Undead were an exception—the more corpses there were, the more excited they became.
The bloodier the war, the more deathly energy and remnant souls they could absorb nearby.
It was difficult to defeat such opponents through a head-on war of attrition.
Therefore, it was quite a perfect match for the Blood-Burning Demons to bring in the undead power of some Undead as support.
Demons could also absorb special powers such as remnant souls.
That was a clear case of shared traits and racial complementarity.
As for the origins of the Undead who had cooperated with the Blood-Burning Demons, Zong Shen had no idea.
The Strategy Module did not know much about such matters beyond this realm either.
At the end of the previous era, there had been no overly powerful undead lords among the invading Blood-Burning Demon legions.
There had only been supporting undead of Tier Six and below, supplemented by a small number of Legendary Tier undead.
It was not that there had been no demigod-level undead, but they had been relatively scarce.
The high-end combat power that took part in the war had mainly been those greater demons.
This was also why Zong Shen believed the Blood-Burning Demons merely had a cooperative relationship with a certain group of Undead, rather than an alliance or a hierarchical relationship born of conquest.
Only