It makes sense.
Although the strength of these Mechanism Puppets has been suppressed to the Energy Refining Stage, their bodies are inherently capable of hard resisting the attacks of Nascent Soul Stage Cultivators.
How could puny Energy Refining Cultivators possibly harm them?
After a flurry of flashy attacks from these thirty-something Energy Refining Cultivators, these seventeen Puppets haven't even budged.
They simply couldn't break their defenses!
On the contrary, the lethality of these Puppets had also been limited to the Energy Refining Phase, so it wasn't terrifying.
After a round of battle, the third expedition team, although severely beaten, was mostly able to survive.
At this point, everyone finally understood.
The Tianyang Cave Mansion was not something their lowly Energy Refining Cultivators could covet.
These high-defense Mechanism Puppets were like door gods, keeping all intruders at bay.