prismatic slime

Stinking wizard wants these thing every seven seconds, but I don't know how to get it. Any help?

I finally found a prismatic slime for the quest for the wizard, and after killing it, it dropped two prismatic slimes, probably because I was wearing the burglar's ring. I separated the stack, gave one to the wizard, took the other one back and... well, as title says. I cannot gift it (says...

I was hosting a multiplayer game with a friend of mine when we went off to find the Prismatic Slime. Upon our first encounter, the Prismatic Slime appeared with an item on it and dropped a Rubber Boot upon death. My friend and I did not see the Prismatic Jelly drop from the slime. After...