Hand of Vecna Bane 2.0

While attuned to the hand of Vecna you have disadvantage on saving throws against spells. While attuned to the artifact you can use an action to cast one 5th level spell from it. After you cast the spell, roll a d6. On a roll of 1-5, you cant cast it again until the next dawn. While attuned to the artifact, you have disadvantage on saving throws against spells.