Author Games: Saga of the Tree

The World Tree is sick.
The world of Aimsir is dying.
While the humans of Aimsir panic, ignore the problem, or blame each other, the magical races have decided to take matters into their own hands. They're a part of the world too, and they have a chance to not only avert the apocalypse but also access World Tree, healing and changing it for the better. Or at least, what they think is better.
Are you one of the races sworn to Good, dedicated to healing the Tree and changing it to make life flourish for all? Or are you part of the races dedicated to Evil, ready to shift the balance of Aimsir in your own benefit? Could you be part of Neutrality, commanded to heal the Tree and leave the world as is?
Will your oaths even matter when the power to change the world is at your command?
Find the Tree. Save the world.
The saga is yours.
Do you have what it takes?