So when I first looked over the Swashbuckler I, like many people, thought I could apply the Riposte after every Parry and thus have an awesome replacement for AC. Action Economy went and ruined that for me though, thus I went and played a normal Swashbuckler for a while, which is fun. I like it.
Then I got thinking - Couldn't I just make an Archetype which specializes in Parrying? With obvious drawbacks like "If I want to meet an attack I have to be in the way of it"-dumping of AC? So I got to work, and this is what I came up with. Would this be a viable if obvious homebrew, or is it horribly imbalanced in the long run? Criticism is gladly welcomed, since that is why I posted here in the first place.
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Defensive Duellist
Mobility/AC -> Parry (AKA the Glass-cannon Build)
Most Swashbucklers know that a quick blade can't win a fight alone, that a swift pair of legs and a buckler is as important if not even more so. The Defensive Duellist didn't get the memo. Instead she focuses fully on the blade and all the wonders that come with it. Regular Swashbucklers bring a shield, the Defensive Duellist makes her own.
Riposting Panache (Ex): At 1st level, when an opponent attempts a Combat Maneuver against the Defensive Duellist, she can as an immediate action spend 1 panache point to add her Charisma modifier to the CMD roll against it. If the maneuver is successfully defended against it counts as a parry for the sake of the Defensive Parry and Riposte Deed and can thus be riposted against as the Deed describes.
This ability replaces the Dodging Panache deed.
Defensive Parry and Riposte (Ex): At 1st level, when an opponent makes a melee attack against the Defensive Duellist, she can attempt to parry that attack if she has at least 1 panache point. The Defensive Duellist makes an attack roll as if she were making an attack of opportunity; for each size category the attacking creature is larger than the swashbuckler, the swashbuckler takes a –2 penalty on this roll. If her result is greater than the attacking creature's result, the creature's attack automatically misses. The swashbuckler must declare the use of this ability after the creature's attack is announced, but before its attack roll is made. Upon performing a successful parry the Defensive Duellist can spend 1 panache point to make an attack of opportunity against the creature whose attack she parried, provided that creature is within her reach. This deed's cost cannot be reduced by any ability or effect that reduces the number of panache points a deed costs.
This ability replaces the Opportunate Parry and Riposte deed.
Deflective Blade: At 3rd level, while the Defensive Duellist has at least 1 panache point, she gains the benefits of the Deflect Arrows feat even if she doesn't meet the prerequisites.
This ability replaces the Kip-Up deed.
Flick of the Wrist (Ex): At 3rd level, a Defensive Duellist gains a +1 bonus to attacks of opportunity and attack rolls using the Defensive Parry and Riposte deed. This bonus increases by 1 for every 4 levels beyond 3rd (to a maximum of +5 at 19th level), and it stacks with the bonus gained from the Swashbuckler's Weapon Training.
This ability replaces Nimble.
Duellist's Stance (Ex): At 7th level, while the Defensive Duellist has at least 1 panache point, she counts as 1 size category larger for the sake of calculating CMD and Defensive Parry and Riposte penalties. This increases to 2 size categories at level 15.
This ability replaces the Swashbuckler's Grace deed and the Dizzying Defense deed.