Does Hexblade’s Curse extra damage affect every die rolled? [duplicate]

The relevant part of Hexblade’s Curse states (XGtE p.55):

Starting at 1st level, you gain the ability to place a baleful curse on someone. As a bonus action, choose one creature you can see within 30 feet of you. The target is cursed for 1 minute. The curse ends early if the target dies, you die, or you are incapacitated. Until the curse ends, you gain the following benefits:

  • You gain a bonus to damage rolls against the cursed target. The bonus equals your proficiency bonus.
  • […]

Typically when features add extra damage they clarify that the extra damage only applies to one damage roll, or the added damage just applies to the damage as a whole, like the various cleric subclasses’ Potent Spellcasting:

Starting at 8th level, you add your wisdom modifier to the damage you deal with any cleric cantrip.

Or the Evocation Wizard’s Empowered Evocation (PHB p.117):

…you can add your Intelligence modifier to one damage roll of any wizard evocation spell you cast.

Does this mean the wording of the Hexblade’s Curse would apply to all of the dice rolled for the attack? If when the warlock gains Pact of the Blade at 3rd level, could they pick a great sword as there pact weapon, which deals 2d6 damage, and add their proficiency bonus twice to the damage?

Hexblade’s Curse + Booming Blade’s secondary damage

While trying to minmax a build for a Bladesinger by way of the new TCoE book I happened upon a curious problem with which I need assistance. The bonus damage from Hexblade’s Curse reads

[…] You gain a bonus to damage rolls against the cursed target. The bonus equals your proficiency bonus.

So my question can be summed up as ‘What constitutes a separate damage roll?’ Are damage rolls separated by source? Perhaps by damage type? Are they separated by when the damage is dealt?

For example…

A creature is struck by a Bladesinger/Hexblade using the special Extra Attack feature in Tasha’s Cauldron of Everything; once using a 7th level Shadow Blade, and once using Booming Blade. The creature is under the effects of Hexblade’s Curse.

How is the damage calculated? Is the Hexblade’s curse damage applied to the initial strike, the second strike, and the damage the creature takes when it moves? Or is the curse damage ignored when the creature moves since the source of that damage has already dealt the curse damage?

How does multiclassing affect the damage scaling of Hexblade’s curse? [duplicate]

So,I am playing a multiclass character with level 14 in fighter and level 1 in Warlock. Now Hexblade’s curse damage depends on player’s proficiency bonus.My level 15 character’s proficiency bonus is +5 but a level1 warlock’s proficiency bonus is +2. So, which proficiency bonus should I add as hexblade’s curse damage?

Does the artificer’s Enhanced Weapon stack on top of hexblade’s Improved Pact Blade?

I play a hexblade warlock with an Improved Pact Blade longsword. I like the idea of the eldritch tinkerer, who builds his patron’s gifts into his gadgets, which fits in a warlock/artificer multiclass. The artificer’s Enhanced Weapon infusion would be very nice with the warlock if it stacks with the Improved Pact Blade bonuses, but I can’t tell if it does from the class descriptions. Do these features stack, or do I need to rethink this build?

How do the damage from the Hexblade’s Curse feature and the Hex and Bestow Curse spells interact/stack with one another?

Hex requires concentration, while bestow curse at a high level and Hexblade’s Curse do not. This allows all three things to stack.

  1. Hex deals damage whenever an attack hits
  2. Bestow curse deals damage whenever an attack or spell inflicts damage
  3. Hexblade’s Curse adds damage to all damage rolls

If all three were applied to a target, for every time I hit it, would it unfold as follows:

Hit, hex damage, bestow curse damage triggered by hit, bestow curse damage triggered by hex, and all 4 damage rolls get boosted by Hexblade’s Curse?

Does Eldritch Smite gets bonus from Hexblade’s Curse, Hex or Fighting Style: Dueling?

I’m making a Polearm master hexblade warlock and thinking about getting a level of fighter for Dueling Fighting Style. Does it boost Eldritch Smite damage?

While I was thinking about this question I also thought Eldritch Smite should get bonus from first level spell Hex and Hexblade’s Curse, is that right?

What ability score does a Hexblade’s Pact Weapon use for attack and damage when wielded by another character?

I read this question about other PCs using pact weapons and realized that I’m not sure if the weapon would use the warlock’s Charisma, or the other character’s Strength/Dexterity for attack and damage rolls.

Now, the text of Hex Warrior says “when you attack with that weapon you can use your Charisma modifier…” Am I right in assuming that another character that uses the weapon (a barbarian, say) would use their ability scores, rather than the warlock’s Charisma?