In the situation where all of one's fresh blood is drained, even a Deity would not fare well. Although it wouldn't lead to death, it's certain that the Deity's condition would significantly deteriorate. And if those blood monkeys were to launch a few attacks at such a time, no matter how strong the Deity is, it would surely lose its life.
Without a doubt, it is believed that the Deities who went missing after entering this Gorge mostly fell victim to those blood monkeys. Judging by the circumstances at that time, the living being, having been drained of its blood by the blood monkeys, should have had no chance of surviving.
But in fact, just when Zhou Tian thought that the living being was doomed, it survived fine.
Contrary to its initial state of being unable to move, when Zhou Tian thought it was doomed after being drained by the blood monkeys, unexpectedly, that living being suddenly threw those blood monkeys off its back and fled without a second word.
