In an alternate universe where the events of ‘The Ending of the End,’ unfold differently, Starlight got the upper hand on Chrysalis during their duel, and quickly encased the changeling queen into a skin-tight cocoon of rubber. With Chrysalis captured, it wasn’t long before her allies were, too, and Equestria was saved.
 
After a rather quick trial, Chrysalis was taken to the Canterlot dungeons and imprisoned for life. Starlight comes to visit her daily, both to gloat over her rubberized captive (the cocoon has fused with Chrysalis’ skin, making it impossible to remove), and to amuse herself at seeing Chrysalis slowly starting to enjoy the feel of rubber gripping her body, despite her muffled protests to the contrary.
 

 
A request from superfun.