Okay, first post. Liable to be a shite-show, so bear with me as I jump right in.

Hex warrior as a class feature says “When you attack with that ((patron provided)) weapon, you can use your Charisma modifier, instead of Strength or Dexterity, for the attack and damage rolls.” Now, it does not specify that they must -both- be used. This is crucial for the silliness I’m getting at. 

Reckless attack says “When you make your first attack on your turn, you can decide to attack recklessly. Doing so gives you advantage on melee weapon attack rolls using Strength during this turn.” Do note, it only specifies the attack roll, and says nothing of damage rolls. 

Furthermore, in the rules regarding making attacks, I saw no mention of using the same modifier for attack and damage rolls (please correct me if I’m wrong here). The Finesse rule is the closest thing to such a limitation.

So! What stops one from rolling with minimal strength, for that sweet advantage and a marginally better chance to hit (and disadvantage to tempt attackers into hitting your armor of Agathys), then using their charisma to pump slightly better damage? I talked it out with a DM buddy, and obviously, common sense would lead one to believe you use the same roll.. which.. yes, makes this purely vibes based ruling. And I respect that. However- I think there’s a solid case to be made for “swinging the weapon physically, and amplifying your damage with your patron’s arcane energy.”

Please, I want to hear thoughts on this! And if I got something wrong please (be gentle) correct me.

Quote from ArntItheBest >>

Quote from WuffyWufferson >>

Okay, first post. Liable to be a shite-show, so bear with me as I jump right in.

Hex warrior as a class feature says “When you attack with that ((patron provided)) weapon, you can use your Charisma modifier, instead of Strength or Dexterity, for the attack and damage rolls.” Now, it does not specify that they must -both- be used. This is crucial for the silliness I’m getting at. 

Reckless attack says “When you make your first attack on your turn, you can decide to attack recklessly. Doing so gives you advantage on melee weapon attack rolls using Strength during this turn.” Do note, it only specifies the attack roll, and says nothing of damage rolls. 

Furthermore, in the rules regarding making attacks, I saw no mention of using the same modifier for attack and damage rolls (please correct me if I’m wrong here). The Finesse rule is the closest thing to such a limitation.

So! What stops one from rolling with minimal strength, for that sweet advantage and a marginally better chance to hit (and disadvantage to tempt attackers into hitting your armor of Agathys), then using their charisma to pump slightly better damage? I talked it out with a DM buddy, and obviously, common sense would lead one to believe you use the same roll.. which.. yes, makes this purely vibes based ruling. And I respect that. However- I think there’s a solid case to be made for “swinging the weapon physically, and amplifying your damage with your patron’s arcane energy.”

Please, I want to hear thoughts on this! And if I got something wrong please (be gentle) correct me.

 I think it's pretty clear that you use the same modifier for both. It says you can use Charisma instead of Str/Dex for the attack and damage rolls, not "or". If it said "or" you would be correct. But per the RAW, you choose a modifier and apply it to both rolls.

Now, you absolutely can make a RogueBarian (Barbogue?) that attacks with a Rapier and use Reckless Attack and Sneak Attack at the same time. Sneak Attack only requires you to use a finesse or ranged weapon, NOT attack using Dex. So stab people recklessly with all of your might, right in that weak spot!

 That is a very fair reading. I wondered about the use of “and”. I doooo think it should be as specific as the finesse rule is, if it’s intended to work as strictly, but that’s the nature of this sorta game. There will be little holes with not-necessarily-intended interactions. But I do generally agree it -should- be the same roll. 

Also, good lord, barbarian sneak attack. How delightfully disgusting. God, I love this game. Lol 

Well crap. I think I know the next silly-build I want to use. Lol

The fact that you must use the same ability modifier for both attack and damage rolls isn't just implied, it is an explicit rule.

"When attacking with a weapon, you add your ability modifier — the same modifier used for the attack roll — to the damage." - https://www.dndbeyond.com/sources/basic-rules/combat#DamageRolls

Nothing in the Hex Warrior feature contradicts this general rule, so it still applies. If you go high enough with Warlock though you can eventually get the Lifedrinker invocation which grants an additional bonus to your damage based on your Charisma, so with that you could get Strength + Charisma + Rage.

Sounds like a fun build! Out of curiosity, is there any particular reason for taking Barbarian to 12? It seems like taking Rogue to level 12 has more to offer.

Quote from Fangeye >>

The fact that you must use the same ability modifier for both attack and damage rolls isn't just implied, it is an explicit rule.

"When attacking with a weapon, you add your ability modifier — the same modifier used for the attack roll — to the damage." - https://www.dndbeyond.com/sources/basic-rules/combat#DamageRolls

Nothing in the Hex Warrior feature contradicts this general rule, so it still applies. If you go high enough with Warlock though you can eventually get the Lifedrinker invocation which grants an additional bonus to your damage based on your Charisma, so with that you could get Strength + Charisma + Rage.

 Okay! That’s what I was wondering. I -had- to be missing something, and you nailed it. In my excitement for the shenanigans, I overlooked it. Alas~