They must be everywhere now that the portals are open.

[Wan said with a nod and then ducked around a large vine that otherwise blocked the view. The familiar sound of short wind blasts could be heard before Jinora would get there and once she was around the vine, Wan would be three stories up at hole in a wall that had been forced thre by a half-dozen vines that twined around each other like a braid.]

This is the only way in to the third floor. The vines cut off the stairs from the first to the second. I'd ask if you can climb, but you're an airbender. It shouldn't be hard for you to get up here.