This is an elegant yet dreadful relic, is an artifact of great power thought to have been lost. Its a golden cube with amethyst crystal shards on its sides. It is called the Catalyst of Oblivion by collectors and historians, within it lies a powerful arcane stone known to few as the Nullstone. It appears as a small, black, unremarkable stone that fits in the palm of the hand. It is rumored to have been created by a powerful wizard in a long-forgotten age to counter the rise of magic users who threatened the balance of power.
While attuned you gain the ability to unlock its strange and arcane configurations. Everytime after you use the artifact you have horrific nightmares the following night and you become vulnerable to psychic damage while its in your possession. It has three primary configurations and once one is engage the artifact is locked in place until the effect ends. The artifect has 8 charges and regains 1d4 at dawn. The artifact can be placed and hover 10 ft off the ground.
Configuration #1 Nullify Magic (6 charges): The wielder of the Nullstone can use this ability to nullify any magical effect within a 20-foot radius for up to 1 minute. This includes spells, enchanted items, and magical abilities. Once the charges are expended, this ability cannot be used again until the stone has been recharged.
Configuration #2 Spell Reflection (4 charges): The wielder of the Nullstone can use this ability to reflect any spell back to its caster. The caster must succeed on a Wisdom saving throw (DC 18) or have their spell redirected back at them. Once the charges are expended, this ability cannot be used again until the stone has been recharged.
Configuration #3 Dispel Magic (3 charges): The wielder of the Nullstone can use this ability to dispel any magical effect on a target within 30 feet. This includes spells, enchanted items, and magical abilities. Once the charges are expended, this ability cannot be used again until the stone has been recharged.
Ultimate Ability:
The ultimate ability of the Nullstone is called the "The Final Solution". When activated, the artifact unleashes a massive wave of anti-magic
energy that destroys the artifact itself and wipes out all magic within a
10-mile radius. This ultimate ability is meant to be a last resort, as
it would mean the end of all magic in that area, but it could also be
used as a way to eliminate a particularly dangerous magical threat. The effect will last for 100 years.