Amulet of tinyness

This amulet of red and blue aura quartz allows one to change their size at will.

At any time, you can use a bonus action to instantly change your size to Tiny. While tiny, you gain +4 to your armor class, advantage on stealth checks, and disadvantage to strength checks and saving throws. Any weapons and equipment you have on you change in size with you. While in this state, your weapons deal 1d4 less damage. You may also use a bonus action to change back to your regular size, reverting any other changes from your change in size.

Notes: Bonus: Armor Class, Advantage: Stealth, Disadvantage: Strength Ability Checks, Disadvantage: Strength Saving Throws