Bad Egg

Obtained from the Mystery Zone on 00/00/2000.

This weird, egg shaped item can be used as a caster attunement. It does not need to be in your hands to be used, just on your person in some way.

???: When rolling initiative, and at the start of your turn,  you gain a 1d4 bonus to spell attack rolls and the saving throw DCs of your spells until the start of your next turn.

Not Close to Hatching: At the start of your turn, you may roll a 1d8. Regain a spell slot of equal or lower level to the roll. (If you are a warlock, and you roll a 6, 7, or 8, you may regain the use of your Mystic Arcanum of that level or lower instead.) Afterwards, you feel a wave of lethargy wash over you, and you cannot take actions or move for the rest of your turn. Once this property is used, it can't be used again until the next dawn.

Cursed: While attuned to this item, you cannot use any other caster attunements to cast spells. Until this curse is broken with Greater Restoration, you are unable to part with this item or unattune to it. 

Notes: by a spellcaster that is not attuned to any other items that increase their Spell Save DC or Spell Attack Bonus.