This is a dragon that I bought a while ago from  DeVout Numelran, an incredibly interesting concept that I have tried to expand upon slightly.

Since I wasn't there during the initial process, I might be very off with what some of the things on the ref sheet means, but I have compiled some information below.

Atana was once named Silvanus, and she was a blue dragon who lived for exploration and knowledge. She always tried to go further than her peers in her search for a further understanding of the world and creatures around her. So when she heard about a certain shrine deep in the wilderness, she had to go there and check it out.
The place was deserted, and it turned out there was a good reason for that. There were corrupted magic at play, but she decided to head for it either way.
This turned out to be a mistake, as her merely entering the little shrine and finding the altar was enough to "doom" her. A curse was placed upon her as she wasn't strong enough to withstand the corrupted magic within.
The next day, she woke up like this, mainly green and with a connection to nature.

I might write this into a story at some point, but basically she ends up being able to control plants, grow them to unnatural sizes and even share energy with them. She could for example devour something with a plant and take some of that energy/mass for herself, and vice versa. She also gained the ability to alter her gender.
The curse does make her unable to travel far as she has to stay close to vegetation at all times. Her magic is also dampened if she ends up not getting enough sunlight.
She ended up adopting the new name of Atana Jehenna, as a kind of way to forget what her old life had been and started anew in the deep wilderness.

That's the short version of the background story, everything else about her is mentioned in the great ref. I might make an actual story to cover what happened and how it did at some point, but for now I think this will do.