The most likely version because you know why

A new artifact arrived to the vault of the canterlot magic catacombs and because it’s aprils job to catalogue all the artifacts of the vault she needs to take a close look at all of them. What she didn’t knew was that inside the golden chest was an ancient slime that likes to play around with his pony victims. Some say it was a reborn creature from another world but other say it’s just a lewd slime… who knows. But either way april might take this chest out of the vault from time to time.