Totem Axe drop location?

I looked around and it seems the Totem Axe can be obtained in The Falls. My question is where in The Falls can it be obtained? Is it a chest drop or a boss drop? I may have to purchase one but would rather try to get the drop. It seems more rewarding to me to get the drop.

Any useful input would be appreciated.

It's a boss drop item. Here's the link:
http://gw.gamewikis.org/wiki/Root_Behemoth
The axe is only 3-5k in price, if you want to buy it in game.

Edit: It not a boss drop, why did I put that in? I dont know! hey at least I put the link up.

Not a boss drop. Any Root Behemoth drops them. Also, the wind Riders (or whatever they are) drop the green paper fans.

KANE

Thanks for the replies.