Han Yu did not leave the workshop immediately.
If the completion of the Bane of Amateurs had been a coincidence, then he needed to know. Luck was not something one could rely on in the Slaughtered Moon Divine Blood Sect. Assuming success without verification was the fastest way to get oneself crippled or killed.
So he tested himself again.
And again.
He selected five puppets that were notorious among apprentice level puppet artisans. Not legendary nightmares like the Bane of Amateurs, but still infamous enough that even senior apprentices avoided them unless they were confident in their foundations.
The first was a Split-Joint Guard Puppet.
It had overlapping joint structures that shared stress between paired limbs. If the distribution was off by even a fraction, the puppet would either lock itself rigid or tear its own joints apart when activated. Han Yu assembled it calmly, adjusting the joint tolerances mid process without even consciously thinking about it.
