One interesting concept could be the unique ways the illusion master character creates and manipulates illusions. For example, they might use illusions to protect Hogwarts in a different way than the existing spells. Another could be how they interact with the other characters from the Harry Potter world. Maybe they use their illusions to teach Defense Against the Dark Arts in a more immersive way.
In this fanfiction, a fascinating concept could be the origin of the illusion master. Is it a new type of magic that has been hidden for centuries? Or perhaps it's a gift that a character has developed through unique circumstances. Also, the way the illusion master uses their skills in battles or duels is interesting. They could create illusions of multiple selves to confuse their opponents, or make it seem like they've disappeared completely when they're actually right there, hidden by an illusion.
Chapter 900, "Let You Hold Your Great-Grandchild Sooner!", is the clearest early answer because it turns Grandchild Sooner's situation into a concrete plot event. Early on, The nerve-wracking two days quickly passed..
A practical answer is Chapter 20, because it turns the idea into a concrete scene. The chapter opens with Several people turned their heads upon hearing the sound and saw three..., adds pressure through Miss Su, please clarify the situation and do not slander me unnecessarily., and ends on So, he.
Chapter 887, "So the truth is you like me?", is the clearest early answer because the hidden truth stops feeling like mere subtext.
A practical answer is Chapter 19, because it turns the idea into a concrete scene. The chapter opens with What criminal law is this or that, this was originally none of your..., adds pressure through Brothers, go in and drag this bad woman out!" "I'll see who dares touch..., and ends on Please.
Chapter 695, "Is This a Matter of Money?!", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. It opens with Shang Shuyue just felt she was out of luck. and closes on It was less than a month before Jiang Zhao Yuan's sixty-fifth....
Chapter 801, "This Elder Sister Is So Smart", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. The chapter gives readers a real answer by opening on Buchen is quite diligent, he even knows how to tidy up his own...
Chapter 16 is the strongest chapter-level answer because it starts from Just as the words fell, Jiang Shixu swiftly cast his eyes downward. and follows through on Jiang Shixu panicked, set down the bowl, and reached forward to grab her....
A practical answer is Chapter 9, because it turns the idea into a concrete scene. The chapter opens with Exactly, the Qiao Family isn't that great either., adds pressure through Since it was for the Jiang Family's welfare, then as the matriarch, she..., and ends on Qiao, unable to save face.
Chapter 796, "No Such Person?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with The lively family reunion night came to an abrupt halt, and the... and closes on The temperature in the Capital was close to negative ten degrees....
The best chapter pointer here is Chapter 25, "He's Actually Mr. Shen's Son?!". It opens with Therefore, from his childhood, Jiang Shixu had felt an extreme aversion to... and closes on Having worked beside Shen Lan for over a decade, she had been there when....