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I am using the double-bladed scimitar with the Revenant Blade feat from Wayfinder's Guide to Eberron.

The double-bladed scimitar's special feature (p. 74):

Special. When you take the attack action and make a two-handed attack with a double-bladed scimitar, you can use a bonus action to make a melee attack with the blade at the opposite end of the weapon. This attack uses the same ability modifier as the primary attack. The weapon’s damage die for this attack is a d4, and it deals slashing damage.

The part of the Revenant Blade feat (also on p. 74) that mentions the damage:

On your turn, when you use a bonus action to make a melee attack with the blade at the opposite end of the weapon, the weapon’s damage die for this attack increases to 2d4, instead of 1d4.

Let's say I have 16 Dex, so a +3 to my dex mod. If I take the Attack action with the weapon, and use my bonus action for the weapon's special function, do I add my Dex modifier to the damage of the special attack or not? Will it be 2d4+3, or just 2d4?

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  • \$\begingroup\$ Hello and welcome! You can take the tour to learn about the site. Happy gaming! \$\endgroup\$ – Sdjz Feb 22 at 11:27
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    \$\begingroup\$ Note that the Wayfinder's Guide to Eberron has been updated as of the release of Eberron: Rising from the Last War with the final versions of the included content; this includes the double-bladed scimitar and the Revenant Blade feat. (The wording of the weapon's Special property is slightly different, and the feat no longer modifies the double-bladed scimitar's bonus action attack.) It doesn't change the underlying question, but it's something for readers to be aware of. \$\endgroup\$ – V2Blast Nov 22 at 9:10
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You can add your ability modifier to damage from the bonus action attack

The general rule for damage rolls is:

When attacking with a weapon, you add your ability modifier--the same modifier used for the attack roll--to the damage.

So, you can add your ability modifier here because nothing tells you that you cannot.

Unoffical guidance from Jeremy Crawford (5e's lead rules designer), which some may consider authoritative, agrees with this interpretation (credit to V2Blast for providing this quote):

"When making a weapon attack, you add your ability modifier to the damage, unless a feature tells you not to.

So far, so good.

But, does this rule for two-weapon fighting, which also grants a bonus-action attack, confuse matters?

You don't add your ability modifier to the damage of the bonus attack, unless that modifier is negative.

Dont worry - this rule can be safely ignored. Wielding a double-bladed scimitar, is not the same as two-weapon fighting, and thus two-weapon fighting rules are completely irrelevant to your situation.

Add your ability modifier to damage rolls as you would with any normal melee weapon attack - your damage roll with this bonus action will thus be 2d4 + 3.

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    \$\begingroup\$ Note that the Wayfinder's Guide to Eberron has been updated as of the release of Eberron: Rising from the Last War with the final versions of the included content; this includes the double-bladed scimitar and the Revenant Blade feat. (The wording of the weapon's Special property is slightly different, and the feat no longer modifies the double-bladed scimitar's bonus action attack.) It doesn't change the underlying question, but it does change the damage roll of the bonus-action attack. \$\endgroup\$ – V2Blast Nov 22 at 9:17
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Based on the wording alone, I think you have answered your own question.

This attack uses the same ability modifier as the primary attack. The weapon’s damage die for this attack is a d4, and it deals slashing damage.

and

the weapon’s damage die for this attack increases to 2d4, instead of 1d4.

So because of this, you would get 2d4 + ability mod.

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  • \$\begingroup\$ Note that the Wayfinder's Guide to Eberron has been updated as of the release of Eberron: Rising from the Last War with the final versions of the included content; this includes the double-bladed scimitar and the Revenant Blade feat. (The wording of the weapon's Special property is slightly different, and the feat no longer modifies the double-bladed scimitar's bonus action attack.) It doesn't change the underlying question, but it does change the damage roll of the bonus-action attack. \$\endgroup\$ – V2Blast Nov 22 at 9:14
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It would follow the same rules as the Polearm Master feat which gives a d4 damage attack as a bonus action. It was clarified in the errata I believe or by Jeremy Crawford? It does add your ability modifier to the damage.

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    \$\begingroup\$ Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Can you support your answer by citing the relevant rules or evidence? \$\endgroup\$ – V2Blast Nov 22 at 9:10

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