Gatekeeping is when someone takes it upon themselves to decide who does or does not have access or rights to a community or identity. /r/gatekeeping is a subreddit for screenshots and stories of gatekeepers in the wild.
Pictures of things that could be boss fights, any kind of picture, gif, or video may be used. Come up with a boss name for the title, and if desired add some stats and or back story in the comments, but please reserve titles FOR boss names and comments for descriptions. Make your title as creative as possible, something more than "lord of x", or "B'oss".