One-handed Zweihander

With extensive training, you learned how to effectively use your strength to balance the weight of a two-handed weapon . You gain the following benefits:

• Your Strength score by 1, to a maximum of 20. 
• You gain Proficiency with all weapons that have the two-handed propriety.
• You can use two-handed weapons as if they were one-handed. When you are wielding a two-handed weapon as one-handed, the value of the damage dice of that weapon is reduced by -2 (or -4, if the weapon is a greataxe), For example, a halberd (1d10) would deal 1d8 of damage when wielded with one hand, while a greatsword (2d6) would deal 2d4 of damage.
• You can also use shields or dual-wield it with a weapon that have the light propriety.