This is the role of thieves, just like opening a treasure box. Without a thief, you could use engineering keys to open it, but the efficiency would be significantly lower.
It's the same with secret chambers; thieves have leads to follow when looking for hidden things, while other professions are much worse at it. Of course, this also depends on the proficiency of the thief.
That's why some thieves aren't suited for group battles, but are nonetheless indispensable to the team.
This secret chamber isn't much different from the previous one. Although mechanical gnomes aren't particularly intelligent, their dedication to and research in engineering is no less than that of real gnomes.
It's more appropriate to call it an engineering laboratory of those guards.
Just like the various engineering materials, these materials are precious to the current Li Yao, so he unceremoniously collects all of them.
