Giant, Stage 3 (Ferocious Slam)

Ferocious Slam. Your hands sprout jagged growths, visibly pushing through the skin of your knuckles. You can use your fists to make melee weapon attacks as a bonus action. When you hit with your fists, the strike deals 2d6 + your Strength modifier piercing damage instead of the bludgeoning damage normal for an unarmed strike.
Once per turn, when you deal damage with your fists, you can immediately expend and roll a Hit Die to magically regain hit points equal to the result of the roll + the damage you dealt with your fists.

Flaw.
Boot Quaker. No matter what your intentions truly are, you can’t help but provoke feelings of fear in smaller creatures. You have disadvantage on Charisma ability checks made against creatures smaller than you, unless you are attempting to intimidate or frighten.