The dead crows in the Yin-Nurturing Coffin had naturally been prepared by Zhou Yan. There were seven of them in total.
These crows were no longer called crows, but Corpse Crows. They were also a type of Corpse Refining.
The teachings of the Profound Yin Corpse Refining Technique were profound and extensive. They included not only the creation of humanoid zombies, but also records on refining beasts and birds into zombies. Some of the intricacies were so ingenious they were truly marvelous.
Corpse Crows were the simplest kind of bird Corpse Refining. They needed only three days of nurturing to take their initial form.
However, Corpse Crows were very weak and had almost no combat ability. They might not even be able to beat a living crow.
But the main purpose of Corpse Crows wasn't to fight. It was to hide and observe.
In other words, these were all Zhou Yan's spies.
Once he sent them out, he could stay in his tent and take in almost everything happening throughout the camp.
This was something Zhou Yan had urgently prepared after learning they would be heading south.
Even without Yue Yuna's instructions, he would have sent the Corpse Crows out to make sure he knew about any unexpected developments as soon as they happened.
Still, Yue Yuna's alertness and caution pleased him greatly.
"By my command, fly!"
Zhou Yan formed a hand seal. The seven Corpse Crows, which had been sitting quietly, all stood up, a flash of black light passing through their eyes.
The next moment, the Corpse Crows seemed to receive their orders. They flew out of the tent one after another, quickly blending into the night outside.
In addition to their naturally black feathers, the Corpse Crows gave off corpse energy and yin energy after being refined,