How do I calculate the damage modifier for Bloodshed Blade?

Question

In the book Bigby Presents Glory of the Giants, Page 111 has the magic weapon Bloodshed Blade where it states the following:

"You can add your constitution modifier (minimum +1) to the damage rolls made with this weapon."

Does this mean that the weapon damage becomes 1dX + [Modifier] + [Con Mod]? Or does this weapon just allow for Constitution to be used in place of Dexterity/Strength?

Answer 1

Features that replace the modifier with another use the word “instead”.

For example, the Hexblade’s Hex Warrior feature is very unambiguous:

When you attack with that weapon, you can use your Charisma modifier, instead of Strength or Dexterity, for the attack and damage rolls.

For a magic item, consider the Snicker-Snack:

While attuned to Snicker-Snack, you have proficiency with greatswords, and you can use your Charisma modifier instead of your Strength modifier for attack and damage rolls made with the weapon.

The druid cantrip shillelagh reads:

you can use your spellcasting ability instead of Strength for the attack and damage rolls of melee attacks using that weapon

All of these features make it abundantly clear that the original modifier used is replaced with a different one. The lack of language indicating replacement, such as the word instead, in the description of the Bloodshed Blade indicates that its damage is the usual damage plus your constitution modifier, 1dX + Mod + ConMod.