Dual wielding beserker

Prerequisite: 14 strength min either Barbarian, Fighter and Paladin

You have studied the art of dual wielding to push your body beyond its normal means. For 1 minute, you can enter into a berserk state in battle and use two-weapon fighting even when the one handed melee weapons you are wielding have the heavy property. After the minute is over you gain one level of exhaustion. returns on a long rest

if the character which has 18 strength:

• You may add your strength modifier to your off hand weapon.
• +1 bonus AC when wielding a melee weapon in each hand
• You can use two weapon fighting, even if the weapons you're using aren't light

if the character has both 18 str (or str 20+) and an improved carry capacity can wield heavy weapons  without using the berserk state

if you use the berserk state you gain an +2 to damage