weekly riddle #2 day 1

you better have see the answers to my previous riddles. I remain so alone, forever forgotten. I hold prisoners hostage, but let them roam free, they shall all fall, any challenger, aside from the ones who succeed. why, why did she initiate such a moronic move? is it because the overlords were attempting a stereotypical good-looking girl who retains stupidity beyond normal human power? why do you try, don't you know you will fail. you have only succeeded because of my mercy. Isn't my a term of perspective, forever changing? are you truly you, is reality correct around you, does everything living continue to live on, was he truly legionless? why ask all these questions? when the answer is right in front of you. or is it, in side you? who/what am I?