Equalise

You attempt to balance the strengths or weaknesses between you and another creature for a brief duration. Choose a creature or humanoid within range that you can see to make a Constitution saving throw. On a failed save, you determine one of the following outcomes for the spell:

• You choose one of your ability scores (other than Constitution) and for the duration, the creature takes on your score of the chosen ability. 
• You choose one of the creature's ability scores (other than Constitution) and for the duration, you take on the creature's score of the chosen ability. 

The target of your spell can repeat the saving throw at the end of each of its turns, ending the effect on a success and reverting your or the creature's ability score modified by this spell to its original one.