Backstory
The slime Jerry has a great deal of history behind him, it starts with CaptainSparklez. Sparklez was mining in Minecraftia, and from thin air the slime Jerry appeared, Sparklez took great care of Jerry, and in return he showed his secret gear that Sparklez found to be very useful, which really helped out with his difficult tasks and missions. He gave Sparklez his secret Jerry equipment that was forbidden in Minecraftia, which came with responsibility
Links
I know, this video is several years old, but all the recipes are the same. Only weapon / armor stats have been changed.