Proficiency
Sylas actually failed on his first attempt, something that he hadn't expected. He thought that the moment he understood the purpose of the challenge, this would just be a simple matter of completing it.
This time, it wasn't a matter of control. The trial didn't ask him to complete the lock, per se. It only asked him to deduce it. The pieces of the lock would then form on their own. So the only person that Sylas could blame was himself for coming up with the wrong result.
'No… my answer should be correct, but I'm still missing something. What is it…?'
Sylas didn't immediately try again. He watched as the pieces of the lock disassembled themselves, lost in his own thoughts.