Artist's description:

"After the events of the movie, the group went on a quest to retrieve more evidence of past Equestria since there were some neighsayers who still didn't believe in friendship, despite magic being returned to the realm. Zipp in particular found many texts documenting a phenomena known as a sonic rainboom, achieved by just one Pegasus. Being a fierce athlete herself she took it upon herself to learn more about this seemingly impossible stunt, and how it once shaped the very basis of friendship itself.

A commission for the lovely AquilaTEagle hope you like it :3"