Bard's Curiosity

This silver ring, is set with a single pink gem and seems to secrete a grey oily liquid of unknown origin. 

"Edon had already witnessed a couple of unfortunate souls turned into Ooze like creatures after touching the very precious looking pink gemstone held by the statue, but he knew that he was different and they were not worthy of such a precious jewel, he strode up and placed his hand on the gem with full confidence, nothing happened he waited, but still he felt the same, he had been right! he lifted the gem in triumph and turned to gloat to his fellow adventurous, but instead of jealous scowls he saw mocking laughter, that's when Edon noticed his legs seemed a lot less sturdy than he last remembered."

Rules - Once per Long Rest the the attuned bearer can can cast True Polymorph on themselves, but can only choose Gray Ooze and the spell does not become permanent if concentrated on for the full duration.

Notes: Utility, Shapechanging, Jewelry