The special reward for the mission left Old Tang somewhat bewildered, a pseudo brainstorm.
It also had only one use, and the effect was quite simple: for a short period, he could mobilize all the knowledge he had previously learned to analyze a problem and come to a solution!
The cost was just as simple, like "Photographic Memory," it would lead to an overloaded state after use.
Yet another cognition-related skill, Old Tang wasn't particularly excited about it, as with the present case situation, he could generally handle things on his own.
The difficulty with many cases didn't lie in the law itself; the tricky parts were external to the case, like gathering and solidifying evidence, or finding leads to pursue—these were all far more vital than any thought process.
But it didn't matter; having the skill was better than not having it at all.