Two weapon fighter

By studying and practicing two weapon fighting their entire life, fighters with this Archetypal have become very effective in using two weapons simultaneously in attacks. This allows them to deal increased damage

Dual wielding

At 3rd level, you have mastered fighting with two weapons gaining the following benefits;

-You gain a +1 bonus to AC when wielding a separate melee weapon in each hand

- You can use two-weapon fighting even if the one-handed melee weapons you are wielding aren't light

- You can draw and stow two one-handed weapons where you otherwise would normally only be able to draw or stow one.

Two weapon strike

At 7th level, you gain a special weapons die which gives you the ability of dealing special, two weapon attacks. The special weapons die is a D10. When you hit with a melee attack when you are wielding two separate melee weapons in each hand, roll your special weapons die. On a 1 you attack with both weapons at once. For damage, roll the damage dice for both weapons and add you ability modifiers. 

Flurry

At level 10 you have learned to attack with speed while wielding two separate melee weapons. When you roll a 2 on your special attack die, you attack in a flurry. Roll the weapon dice of both weapons you are wielding and add your ability modifiers. Choose a number of Creatures up to your proficiency bonus that are within 5 feet of you. Equally divide the damage over the Creatures that would have been hit by the original attack role. 

Execution

At level 15 you have become very deadly with your two weapon attack's.

-Your special attack die becomes a D12.

- When you roll a 3 on your special attack die, you perform a execution style attack. For your damage, role double the weapon damage dice of the weapons you are wielding and add your ability modifier. Also the target of your attack's has a - 1 penalty to it's AC until the end of it's next turn. This attack does not benefit from a critical hit. When the original attack role is a critical hit, you choose whether you roll for the normal critical hit or use the execution option when determining the attacks damage. 

Master of two weapon fighting

At level 18 you are the ultimate two weapon fighter. When you are wielding a separate melee weapon in each hand, their base weapon damage dice go up 1 in size. (d4s become d6s, d6s become d8s and d8 become d10s).