Improved Great Weapon Master

While wielding a melee weapon with the heavy property, you gain the following benefits.

• On your turn, when you hit with a melee weapon and reduce a creature to 0 hit points with it, you may deal 1d10 weapon damage to an adjacent enemy.
• When you deal damage with a melee weapon that has the heavy property and you are wielding it in two hands, you deal additional damage equal to half your STR modifier rounded down.