Board Thread:General Discussion/@comment-31338621-20170223022025/@comment-25449165-20170318212240

Technically Healthcliff isn't the "true" final boss of the game, whereas is actually , as revealed in Ordinal Scale.

Even if Healthcliff was, he's still considered the strongest player in SAO. His Holy Sword ability allows him to switch between Offense and Defense immediately, with no time lag whatsoever. So if multiple players jump at him at the same time, he'll immediately switch to defense and take nearly no damage. For a man as intelligent as him, he would never allow his opponents to overpower him in a way he can't (albeit he made an exception for Kirito).

Even if they did find a way past Healthcliff, they still would have to fight the true boss, which, after watching the movie, could be impossible. The monster kept regenerating faster than the players could damage it. Not to mention it had six health bars and an extremely overpowered final attack. Kirito mentioned that there was a level cap in the game, but no one actually ever reached it. My theory is that if someone did, they'd probably have a better chance with it.

Anyway, it would be a miracle if they could at least damage Healthcliff.