Gorilla Grip

This is Homebrew. Ask your DM if you can use it.

You've mastered balancing the weight of mighty weapons in combat. You gain the following benefits:

• You gain proficiency with all heavy weapons. 
• You can wield a two-handed melee weapon within one hand.
• You gain the property of a versatile weapon even if you are wielding it within one hand.
• If your size is Small, heavy weapons no longer impose disadvantage on attack rolls.
• If you have the Powerful Build trait or a similar trait, oversized weapons of the large variety no longer impose disadvantage on attack rolls, otherwise these weapons do not gain the other benefits of this feat.