Gamemode suggestion, Bridge of Khazad Dum, LOTR styl

So, I was thinking wouldn't it be cool to have a game mode where you can have a giant prehistoric chogath with like sunfires or something, chasing after various champions kinda in a lotr mode where you have to escape the giant chogath. And like the greybeard veigar has to stop cho gath, with a you shall not pass moment.