Disclaimer: Written for fun. If I could profit from this, I wouldn't be giving it away.
The wind blew cold over the snow covered mountains. The dim light illuminated a lone figure trudging under the evergreens. His feet sank deep in the snow and he struggled to keep upright against the wind and poor footing. The sack thrown over his shoulder containing some unrecognizable shapes didn't help his balance.
The nearest human was probably in a village miles away in the foothills of the Ural mountains. Never the less, the man mumbled to himself as he pulled his winter cloak tighter around himself. A gust of wind blew back the hood revealing messy, black hair. He reached a clearing and stopped in the middle of it.
Pulling a wand from his clothes, he waved it in a complicated pattern. Eldrich power started to build up around the wizard. He stopped the dance-like motion, pulled a large stoneware jug from the bag, and poured water, magically kept liquid, in a circle around his position. The indent in the snow caused by the water started to fill almost immediately as the howling wind blew replacement snow into it. The green, magical aura surrounding the figure darkened within the circle.
Putting the jug back in the bag, he stood in the center of the circle and raised his wand. He released the spell with an incantation called out in a loud voice, his words fighting against the wind.
"Accio Onodrim!"
The energy around him sped out of the circle faster than the wind. Trees shook as it stuck them, then stilled, despite the gale. As if realizing it was no longer productive, the wind died, leaving an eerie silence. Snow continued to fall, further muffling any noises.
He looked around nervously. The silence was broken by creaking trees and shifting branches from one direction in the woods. Something was coming.
Something big.
He fought all his instincts and put away his wand. Two trees seemed to slink out of the way and an eighteen foot tall creature appeared between them and strode into the clearing. The trees resumed their previous positions behind him.
His skin was like bark. His head was crowned by green "hair" that would have looked perfectly natural on a cedar. Two eyes, old beyond reckoning, looked down at the wizard who was feeling very small and vulnerable in the presence of the ancient being. A branch like hand reached down and grabbed Harry Potter. Gently for a creature that could tear down a mountain with those hands it lifted the wizard to eye level.
"Hrumm. Hroom. Is it Christmas time already? Does Luna have to decorate me again?" the Ent asked.
"You know it makes her so happy, Greenlimb."
The Ent slowly nodded, as he did everything slowly, and prepared himself for the magical trip to the tower in Ottery-St. Catchpole.