Improved Great Weapon Fighting

In addition the the STR requirement you must have the Great Weapon Fighting fighting style or the Great Weapon Master feat.

Strong and defiant, you gain the following benefits.

• Increase your Strength or Constitution score by 1, to a maximum of 20.
• If your size is medium or larger, or you have a natural STR of 19, you can wield melee weapons (and crossbows) with the Two-Handed property with one hand. Additionally when calculating damage, weapons with the Two-Handed or Versatile properties are always treated as if you were wielding them with two hands.
• You ignore any disadvantages granted by the Heavy Property of weapons when those weapons also have the Two-Handed or Versatile properties. You also ignore the Heavy Property on these weapons when choosing Kensei weapons.

"Blacksmith said Groagbak can't weird big axe with one hand. HA! GROAGBAK PROVE BLACKSMITH WRONG!" -Groagbak the Barbarian.