There is a Legacy version
here.
Two-Weapon Flurry [one-action] Feat 16*Fighter Flourish Press Source Player Core pg. 150 2.0Archetype Dual-Weapon WarriorRequirements You are wielding two weapons, each in a different hand
* This version of the Two-Weapon Flurry feat is intended for use with an Archetype and has a different level for access than the
original feat.
Using the momentum of your prior attack, you lash out with both your weapons in a sudden frenzy. Strike twice, once with each weapon.
Archetype Use
This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.
Traits
Flourish: Flourish actions are actions that require too much exertion to perform a large number in a row. You can use only 1 action with the flourish trait per turn.
Press: Actions with this trait allow you to follow up earlier attacks. An action with the press trait can be used only if you are currently affected by a multiple attack penalty. Some actions with the press trait also grant an effect on a failure. The effects that are added on a failure don't apply on a critical failure. If your press action succeeds, you can choose to apply the failure effect instead. (For example, you may wish to do this when an attack deals no damage due to resistance.) Because a press action requires a multiple attack penalty, you can't use one when it's not your turn, even if you use the Ready activity.