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I am playing, as well as about to start DM'ing a one shot, in fifth edition D&D and one of my soon-to-be players has talked to me about making either a Fighter (Samurai) or Monk (Kensei) and was wondering if there was any feat that acted like the Bard's "Expertise" class feature but for weapons rather then skills.

While I have found some homebrewed content for this, I haven't found anything official, but I just might not be looking in the right places. Is there something like this or at least a homebrew that is relatively balanced?

Edit: Rather then adding the bonus to attack roll I was looking for something that just effects Damage even if it was a just 1/rest effect. I know that "Great Weapon Master" effect is a -5 to hit, +10 to damage. But I was hoping that there was something like, all attacks deal x2 Proficiency Damage for this turn, 1/rest, so the "Arthur the Archer" example wouldn't effect his to hit chance just the damage he deals IF he hits.

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  • \$\begingroup\$ @Erik please don't answer in comments. \$\endgroup\$ – nitsua60 Dec 12 '17 at 10:52
  • \$\begingroup\$ My player was pretty understanding after I explained the main problems with this type of feat, so thanks for helping. \$\endgroup\$ – ValorGlory Dec 12 '17 at 18:11
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There is no such official feat. Even in the Unearthed Arcana article that included weapon mastery feats, said weapon mastery feats only gave +1 to attack rolls with the weapon in question, rather than doubling your proficiency bonus.

More fundamentally, you asked whether there was any material doing this that's relatively balanced. The closest thing to what you're asking about is the Oath of Devotion Paladin's Sacred Weapon ability, which allows them to add their Charisma modifier to attack rolls. However, this is usable 1/rest, only lasts a minute, and requires an action to activate.

What you're asking about is an always-on bonus to attack rolls that starts at +2 and scales up to +6. No such ability, homebrewed or otherwise, could exist and be reasonably balanced. D&D 5e incorporates the concept of 'bounded accuracy', which means that numerical bonuses to attack rolls in particular are rare, and fairly small.

For a more practical example of why a feat like this can't be balanced, consider Arthur the Archer. Arthur is level 17, and has the Archery Fighting Style, a Dexterity score of 20, and your hypothetical feat. This gives him a bonus to attack rolls of +19. This means that, against the vast majority of enemies, Arthur can only miss if he rolls a 1 (since that's an automatic miss).

So why is this a problem? Because at high levels, everyone who's planning on using a weapon to fight has to have this feat. This isn't necessarily a bad thing - if you want a game where high-level characters almost never miss, introducing this feat and encouraging your players to take it will provide that. But in terms of balance with existing material, such a feat cannot be balanced.

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    \$\begingroup\$ And it totally breaks the fun of character building, because once it gets to you must have THIS otherwise you suck, this feat becomes a tax rather than an option. Might as well give it for free at lvs 18 ~20 (or whenever) if it is becoming mandatory. \$\endgroup\$ – Mindwin Dec 12 '17 at 9:58
  • \$\begingroup\$ Also consider what happens when Arthur also takes the Sharpshooter feat and is still landing every shot with a +10 damage bonus. \$\endgroup\$ – Doval Dec 12 '17 at 17:42
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No, there is no equivalent of "expertise" for attack rolls (or saving throws). Being proficient, with your normal proficiency bonus is the best you can get. Given 5e's bounded accuracy, doubling proficiency on an attack would be overpowered. Even without that, it's pretty easy to hit. A high level character will likely have a stat bonus of +5, and a proficiency of +5 or +6, and may have a +2 or +3 weapon -- that adds up to about a +13 to hit. Since AC much over 20 is rare, that means a high level fighter has a high chance of hitting pretty much anything already.

To address your edit, there are several ways to add damage: dueling fighting style; low level spells such as Hex, Hunters Mark, Divine Favor; a few levels of Rogue for Sneak Attack; a couple levels of Paladin for Divine Smite; a level of Barbarian for Rage; etc.

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