Master Dual Wielder

You master fighting with two weapons to a level that surpasses normal limits, gaining the following benefits:

• You gain a +2 bonus to AC while you are wielding a separate melee weapon in each hand and not wearing heavy armour.
• Using one action and one bonus action you can perform 4 attacks targeting the same creature, 2 with each equiped weapon, with each subsequent attack after the first having a -1 penalty to hit.
• Using one action and one bonus action you can perform a massive attack targeting one creature that, if it hits, deals double the amount of dice in damage of each weapon held in each hand combined plus any other modifiers.