Dual Weapon Slash

You've learned to attack with 2 weapons simultaneously. You gain the following benefits:

• On your turn, when you score a critical hit while wielding 2 weapons or reduce a creature to 0 hit points with them, you can make one melee weapon attack as a bonus action.
• Before you make a melee attack while wielding 2 weapons that you are proficient with, you can choose to take a -5 penalty to the attack roll and attack with both weapons. If the attack hits, you roll damage for 1 weapon normally and add +10 to the attack's damage.
• If you attack in this manner you cannot use two weapon fighting as a bonus action.