Glowpeach Hexmallow

Marshmallow Magic This marshmallow has a simple and sweet peach flavor. In darkness, it glows softly with an orange light that seems to come frome the core of the marshmallow
  You can use a bonus action to eat this marshmallow, when you do, you gain a bonus to all Athletics checks you make equal to your proficiency bonus until you finish a long rest. However, for the duration you also suffer a negative penalty to all Acrobatics checks you make equal to your proficiency bonus. For the duration, you cannot gain the benefits of any other hexmallow.