When worn, this ring immediately causes a funny tingling sensation in the wearer’s finger, and the purple gem begins to pulse with a smokey light. Slowly, this smoke begins to extend from the ring, forming around the wearer’s body. Over the course of an hour, the smoke spreads to cover the wearer’s body entirely in a shifting purple cloud.
Once it is fully active, the cloud functions as a suit of plate armor which is not encumbering, and does not impede movement in the slightest. Wearing it feels no different than wearing loose clothing made of lightweight cloth, and as such, does not impede spellcasting at all. Note that its protective effect begins only after the ring has been worn for 1 full hour, to allow the smoke to spread fully over the body. Note also that the ring does not grant any armor bonus in addition to armors which are already worn. A character wearing plate armor and this ring only receives the protective benefits of one.
Unfortunately, after an hour has passed and the armor is active, the wearer’s every movement makes a cacophony of noise. A simple motion of the hands is as loud as clashing swords, and every step sounds like a cascade of copper pots being banged together all at once. Because of this, while the armor is active, random encounters will be rolled 3 times more frequently than normal. This can be simulated either by rolling more frequently, or simply by rolling 3 dice every time you would normally roll a single check.