A higher up on a forum. They have the power to ban. They are a troll's worst nightmare.
Not everybody can be a moderator. It's takes some skill. You can't be a complete tightwad and keep banning people for no real reason like in Gamespot. You also can't be too mellow and let all the trolls run loose like in GameFAQS.
The moderators on SydLexia.com are the best on the web.