Gem of Power (5e Equipment)

Wondrous Item, legendary (requires attunement)

This gem pulses with raw power. As an action, you can draw upon the power of the gem to drastically enhance your physical might. For the next 10 minutes, your carrying capacity quadruples, you have advantage on Strength checks and Strength saving throws, and you can treat a d20 roll of 14 or lower as a 15 for Strength checks and Strength saving throws. Furthermore, your melee attacks deal 3d6 extra damage. Once you have used this property of the gem, you can't use it again until the next dawn.