Sorry if english is bad - I am russian, it's sometimes hard for me to write in english properly... Not to mention I has a habit of writing things half-asleep.

This fanfiction [chapters 1-3 and unpublished finale] predates half of the season 2 and all the 3rd, I added relevant details later.

After earthquake the strange lake was discovered in the mountains near Equestria. Rainbow Dash was first to discover it, and find out the strange effect its water has on ponies. Unfortunately for her, after other ponies found this lake, it became obvious that her old, weird secret can't be a secret anymore.