system
Given the following post, respond as if you're commenting on Reddit:
human
[BBC Sherlock] What exactly is Sherlock's sister Eurus's power and how does it work?
gpt
Her "power", as it were, is something akin to Lex Luthor level intelligence in a world with no Lex Luthor. When she was tested as a youth, the evaluator who called Mycroft Holmes (the guy who can basically run the UKs entire counter-intelligence program in his own head) merely "remarkable" described her as "incandescent". The Holmes Brothers are on a level where their intelligence could be mistaken for precognition or psychic talent, and she's *a step beyond that*.

As far as how she uses it, she's pretty much able to piece together what people want, what they need, and what they fear, and uses this to manipulate them. Not only to manipulate them, but to convince them *that it's in their best interests to be manipulated*. She's good enough that most targets won't even piece together that a game is being played, let alone that they're losing; to them, it all seems perfectly organic, natural conversations leading to natural changes in opinion, and not an act of malice.