Awakened Ring of Magic

The ring of magic is a golden artifact forged by a mysterious god.

You gain following abilities: 

• Armor class increase by 3.
• Spell Attacks modifiers increases by 3.
• Spell Save DC increases by 3.
• Advantages on constitution saving throws. 
• Advantage on saving throws against spells and magical effects.
• While  attuned to this ring you hit point maximum increases by 4 every level.
• You attunement slot increases to 6.
• You gain immunity to fire and cold damage.

Notes: Bonus: Armor Class, Bonus: Spell Attacks, Bonus: Spell Save DC, Advantage: Constitution Saving Throws, Advantage: Saving Throws, Bonus: Hit Points per Level, Set: Attunement Slots, Immunity: Fire, Immunity: Cold, By wizard