Such being the case, attacking the Beastman Territory had already become an impractical method, so those Ancient Powerful Beings had no choice but to resort to using bait as a means to achieve their goals at that time.
Given the situation then, putting themselves in others' shoes, although Zhou Tian's situation was not very good, those Ancient Powerful Beings believed that if he suddenly encountered some Treasures he couldn't part with, even if he knew the Danger, he would likely try to snatch that Treasure. Under such circumstances, those Ancient Powerful Beings could take advantage of Zhou Tian's psychology and try to Kill him directly.
