Ye olde Goblin king in ancient times tried to find a way to protect his treasure forever. He petitioned an even more ancient slime living in his dungeons to move a piece of itself into the vaults and offered to feed it his own soul when he finally died.
The day finally came and the slime-piece ate the king's soul. But instead of protect the treasure, it began to eat it, dissolving down the metals and minerals contained in the priceless artifacts. It grew and divided into more pieces as it ate, becoming goblin-like in shape. The king's greedy soul became the template for a new life-form. The Globbins were born.
The Globbins love all manner of opulent, shiny and sparkling things - they spend many long hours deciding what is worth eating and what is worth keeping around. Their bodies are often encrusted with jewels and draped with bracelets and necklaces of precious metals. They've developed a tradition of using the vast stores of metal bullion they make to craft statues and figurines of a mythical god-king, whos name and image the Globbins are quite reverent of.