Boon of Storm Giant's Blood

You gain the ability to use a bonus action to turn into huge size for 1 minute, increasing your carry weight and your gear grows with you although your weapons or gear does not gain the benefit of an oversized weapon, You also deal an extra lightning damage equal to your proficiency bonus when using melee weapon attacks, while in this form you also gain resistance to lightning damage, Once you use this ability you regain it once you finish a long rest.

while being a huge sized creature you gain a -2 to ac