This story takes place about mid season two, as far as the timeline of canon is concerned. It is definitely well before Twilight became an Alicorn so she is still a Unicorn in this story.

The premise;

A very dangerous set of winds have been released from a secluded temple located deep in the Everfree Forest. They have already blown through Ponyville and Three of the Six bearers of the Elements of Harmony have been affected by the winds, locked in a permanent comatose state until the winds have been dealt with. Now, with Twilight, Rarity, and Rainbow Dash stuck in Ponyville to watch over the defenseless, a new team of ponies must adventure into the Dangerous Everfree Forest, and combat both the winds, and whatever released them. Will they be able to succeed?