While wearing this ring, you gain the following benefits:

• Your Intelligence score increases by 2, with no maximum limit.
• Your Constitution score decreases by 2. 
• You take a –2 penalty to Wisdom saving throws.
• You gain 3 charges of Spell Amplification. 

Spell Amplification: When you cast a spell that requires an attack roll or forces a target to make a saving throw, you can expend 1 charge to roll the attack roll with advantage or force the target to make its saving throw at disadvantage. Immediately at the end of any turn in which you expend a charge in this way, roll a d6. On a roll of 1, Dreghan’s Soul takes hold, and Dreghan gains control of your character until the end of your next turn. The ring’s expended charges are replenished when you finish a Long Rest.

Additionally, this ring cannot be removed from your finger by any means other than your own will.

Notes: Bonus: Intelligence Score, Bonus: Wisdom Saving Throws, Bonus: Ability Score Maximum, Bonus: Constitution Score