One day, Spike went with Twilight and Cadance to a valley near the Crystal Empire where they found an unexplored cavern. In there, Spike found some crystals that caused his personality to split up into a lot of copies of himself, and they ended up running free in the valley, now Twilight and Cadence must find them all before the original Spike disappears...

Not really proud of the writing here, but I did the best I could.
Someone already got the reference in the comments, so it's from the show 'Wander Over Yonder', but I changed some things in this fic so it's not exactly the same.
Still need to work on the grammar, orthography and pacing, ESPECIALLY the pacing.
Set between King Sombra's attack to the Empire and Twilight's BIG moment (Season 3).
Let's see which one of you can spot the errors on the story XD