The Master Ring was crafted by the Dark Lord to exercise control over the other rings of power. While you bear the Master Ring, you gain advantage on Charisma (Intimidation) checks. The bearer of the ring develops an unusually strong attachment to it, and is unwilling to give it up or abandon it. You can use an action to make a DC 20 Charisma check to relinquish the ring. On a success, you can remove the ring from your possession. If the check fails, any further attempts made by that creature automatically fail until 24 hours have elapsed.

Dark Speech. While you are wearing the Master Ring, you can use an action to speak words in a foul language known as Dark Speech. Each time you do so, you take 1d12 psychic damage, and each non-evil creature within 15 feet of you takes 3d6 psychic damage.

Terrifying Vision. While you are wearing the Master Ring, you can use an action to cast weird with save DC 18. You can’t use this property again until the next dawn.

Unseen World. While you are wearing the Master Ring, you are invisible and can see into the Ethereal plane.

Personality. Though not sentient, the Master Ring contains a fragment of the soul of the Dark Lord. While separated from the Dark Lord, the ring will strive to return to him, both by impelling its bearer to yield to the Dark Lord or his servants, or by abandoning its possessor at key moments. While worn, the Master Ring may force the wearer to succeed on a DC 15 Dexterity saving throw. Upon failure, the ring will slip from the possession of the wearer and fall to the ground.

Curse. The power of the Master Ring inevitably corrupts even the most noble hearts. Each time the ring is worn, you must succeed on a DC 20 Charisma saving throw or suffer one level of exhaustion. Levels of exhaustion gained in this manner cannot be removed while the ring is in your possession. A bearer reaching the sixth level of exhaustion in this manner does not die, but succumbs to the will of the Dark Lord. If that happens, you become an NPC under the DM's control.

Destroying the Master Ring. The only way to destroy the Master Ring is to cast it into the fires of its creation.

Notes: Advantage: Charisma Ability Checks, Invisible, Buff, Debuff, Cursed, Jewelry