It deliberately didn't tell him the truth so as to leave a way out for itself.
But clearly, the Ghoul wasn't aware of it.
If it didn't die, there was no way for them to leave the cave.
Of course, the most important thing was that the Ghoul had killed too many of their compatriots.
Klein looked at the humans hanging below the blood lake.
Thankfully, it was daytime.
If it was nighttime, with so many humans hanging above the blood lake, most people would probably be scared to death.
Therefore, no matter what the Ghoul was, it couldn't be left alive.
As for why Klein didn't think of it as a snake and kill it after getting the information out of it?
The reason was that Klein was afraid that the Ghoul had other tricks up its sleeve.
After all, he had come to this world by relying on the power of the scroll.
