Shocking, how Celestia never taught Cadance the Royal Canterlot Voice. And Twilight will need to learn it as well. What can a Princess of the Night do but hold a class to teach this essential art for princesses? Hopefully she knows how to maintain classroom discipline....

Cover by Guardian Core.

In a world full of magic, mere words can pose a deadly threat. When simply reading a sign can instantly infect the unwary, and cases start to turn up all around Ponyville, Twilight Sparkle casts the only spell she can find that can give her the time she needs to find the cause of the plague. But then she has to figure out how to stop the epidemic... without being able to read.

Editing provided by Spabble
If you like this, try Rainbow Typhoon
Audiobook on YouTube and for download on SoundCloud
Spanish version translated by MIkimoco
Russian version