There is a Legacy version
here.
Vicious Swing [two-actions] Feat 4*Fighter Flourish Source Player Core pg. 141 2.0Archetypes Mauler,
Mauler* This version of the Vicious Swing feat is intended for use with an Archetype and has a different level for access than the
original feat.
You unleash a particularly powerful attack that clobbers your foe but leaves you a bit unsteady. Make a melee Strike. This counts as two attacks when calculating your multiple attack penalty. If this Strike hits, you deal an extra die of weapon damage. If you’re at least 10th level, increase this to two extra dice, and if you’re at least 18th level, increase it to three extra dice.
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.
Vicious Swing Leads To...
Furious FocusTraits
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.