I think you can.
I am looking at a Bugbear build and the 2d6 damage boost that comes in the first turn.
I think with dueling you can start a turn with a light thrown melee weapon in one hand and a light melee weapon in the other. Use the attack action to throw the thrown weapon then close and use TWF to attack with the other weapon and get the dueling damage bonus on the second weapon (but not your dex/strength bonus).
I think this works RAW.
TWF: "When you take the Attack action and attack with a light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a different light melee weapon that you’re holding in the other hand. You don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative. If either weapon has the thrown property, you can throw the weapon, instead of making a melee attack with it."
So you take the attack action with the thrown weapon then the other weapon qualifies for a TWF bonus action attack even though you are now only holding one weapon
Now Dueling: "When you are wielding a melee weapon in one hand and no other weapons, you gain a +2 bonus to damage rolls with that weapon."
Since you threw the thrown weapon already you are now holding a melee weapon in one hand and no other weapons, so I think the bonus action attack gets the dueling damage bonus.
Once you have extra attack I think you could get 2 attacks with the melee weapon (one using Extra attack and one using TWF) and get the dueling bonus on both of those attacks. On a Bugbear you would also get +2d6 on each of these attacks if the opponent has not yet had a turn, which is an extra 6d6 damage once extra attack is online.
I am looking at a Bugbear build and the 2d6 damage boost that comes in the first turn.
I think with dueling you can start a turn with a light thrown melee weapon in one hand and a light melee weapon in the other. Use the attack action to throw the thrown weapon then close and use TWF to attack with the other weapon and get the dueling damage bonus on the second weapon (but not your dex/strength bonus).
I think this works RAW.
TWF: "When you take the Attack action and attack with a light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a different light melee weapon that you’re holding in the other hand. You don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative. If either weapon has the thrown property, you can throw the weapon, instead of making a melee attack with it."
So you take the attack action with the thrown weapon then the other weapon qualifies for a TWF bonus action attack even though you are now only holding one weapon
Now Dueling: "When you are wielding a melee weapon in one hand and no other weapons, you gain a +2 bonus to damage rolls with that weapon."
Since you threw the thrown weapon already you are now holding a melee weapon in one hand and no other weapons, so I think the bonus action attack gets the dueling damage bonus.
Once you have extra attack I think you could get 2 attacks with the melee weapon (one using Extra attack and one using TWF) and get the dueling bonus on both of those attacks. On a Bugbear you would also get +2d6 on each of these attacks if the opponent has not yet had a turn, which is an extra 6d6 damage once extra attack is online.
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