Amulet of Anzakanari'Ro

The Amulet of Anzakanari'Ro is an hand hammered electrum disc roughly nine inches across, that bears Draconian script but using words from Dark Speech inscribed in concentric circles that lead to a marble sized onyx stone embedded into it's center. 

Minor Beneficial Properties:

• While attuned to the artifact, you have resistance against radiant damage.
• While attuned to the artifact, you can use an action to cast Blink from it. After you cast the spell, roll a d6. On a roll of 1–5, you can’t cast it again until the next dawn.

Major Beneficial Properties: 

• While attuned to the artifact, your walking speed increases by 10 feet.

Minor Detrimental Properties:

• While attuned to the artifact, you are Deafened when you are more than 10 feet away from it.
• While attuned to the artifact, you deal 1d6 necrotic damage to any plant you touch that isn’t a creature.

Major Detrimental Properties:

• The artifact imprisons a Death Slaad (see the Monster Manual). Each time you use one of the artifact’s properties as an action, the slaad has a 10 percent chance of escaping, whereupon it appears within 15 feet of you and attacks you. The Death Slaad is the source of the Amulet's power, and if the Slaad is released, the amulet is destroyed even if a 100 is rolled on its Charge Reset.

A single charge resides within the amulet. Perhaps it held more charges previously but as of yet, no known methods of recharging the Amulet of Anzakanari'Ro have been discovered. While attuned to the Amulet of Anzakanari'Ro, the bearer obtains the following ability:

Extended Spell

When you cast a spell that has a duration of 1 minute or longer, you can choose to double its duration, to a maximum duration of 24 hours.

Channel The Weave: By expending the charge within the Amulet of Anzakanari'Ro, the attuned can gain the power to cast 9th level spells for 30 seconds, with 5 available spell slots to use. During this time, violet-green tendrils of energy can be seen being pulled from the surrounding area and drawn into the attuned. Each round that passes, the attuned glows brighter with arcane light. At the end of the fifth round the attuned glows with an intensity so powerful that any creatures looking directly at the attuned must make a DC 21 Dex Save to shield their eyes or be permanently blinded. As the light grows to a brightness so intense that the form of the attuned is lost within it, it collapses into a singularity and dissipates with a blink. The process cannot be stopped once activated, and as a price for the power given the amulet destroys both the soul and body of the attuned. Even a wish spell or similar magic cannot undo the process or the destruction of the attuned, or bring them back from the dead.

Notes: When the charge from the Amulet is used, roll a D100, on any result other than a 100 the Amulet explodes with the effects of a 9th level Fireball centered on the bearer., by a spellcaster with a minimum of one fifth level spell slot. Attuning to this item removes one cantrip from your known list of cantrips, which returns to memory when the item is no longer attuned to the bearer.