Would a race with bludgeoning, piercing or slashing resistance be overpowered?

The various subtypes of dragonborn in D&D 5e have different elemental resistances (acid, cold, fire, lightning, poison). Tieflings similarly have fire resistance, and I would estimate that a variant tiefling with, say, cold or poison resistance instead would be equally balanced.

However, suppose I want to give a race resistance to one of the physical types: bludgeoning, piercing, or slashing. For example, a dragonborn subtype with slashing as its one resistance, or a tiefling with piercing resistance.

Would this be overpowered?

How can I gain resistance to piercing, bludgeoning, and slashing damage while in heavy armor?

I am theory-crafting a character that takes very little damage. I want to use the Heavy Armor Master feat to help with damage reduction from non-magical attacks, as well as the Battlemaster maneuver parry, and the Goliath feature stone’s endurance. How can I gain resistance to piercing, bludgeoning, and slashing while also using the Heavy Armor Master feat? I am most interested in answers that don’t depend on external sources, such as other characters and magic items, but I’d like to hear answers including those as well. Multi-classing is an option.

Does Slashing Flourish work with Fancy Footwork?

The Fancy Footwork feature of the swashbuckler rogue says:

At 3rd level, during your turn, if you make a melee attack against a creature, that creature can’t make opportunity attacks against you for the rest of your turn.

The bardic College of Swords slashing flourish feature says:

You can expend one use of your Bardic Inspiration to cause the weapon to deal extra damage to the target you hit and to any other creature of your choice that you can see within 5 feet of you. The damage equals the number you roll on the Bardic Inspiration die.

If I use the slashing flourish attack and hit 4 other creatures around me with it, does fancy footwork affect all of them so they cannot make opportunity attacks against me?

How does the Slashing Grace feat interact with the Swashbuckler Finesse ability?

The posts I have read indicate that it is possible to take the Slashing Grace feat as a Swashbuckler in order to get DEX to damage with a slashing weapon.

As much as I like the idea I see the following problem. The Slashing Grace feat lists as prerequisite weapon finesse with the weapon to be used, in this case a slashing weapon. But the Swashbuckler finesse is only valid for piercing weapons. Therefore, strictly speaking, Slashing Grace could never be applied to a Swashbuckler with a slashing weapon.

On the other hand, the description of the Slashing Grace feat explicitly refers to the Swashbuckler class and states that “…you can treat it as a one-handed piercing melee weapon”.

So, how do these two interact, what is the intention of the RAW rules?

Can green flame blade, slashing flourish, and sweeping maneuver be combined for a massive sweeping attack?

A character with the classes: Rogue(Arcane Trickster) lvl 3, Bard (College of Swords) lvl 4, Fighter (Battle Master) lvl 3, has:

  1. Green Flame blade.
  2. The Bardic College of Sword’s slashing flourish.
  3. Battle Master’s sweeping maneuver.

Can these be used in the same turn against the same 2 foes?

Character is fighting 2 opponents, Casts Green Flame blade and hits target and therefore the “jumping flame” portion of the spell hits the 2nd target as well, and since the attack hit the player decides to use both the flourish and sweep to deal even more damage to the second target.

Do both damage sources stack?

Can both be used at the same time?

Both the slashing flourish and the sweeping maneuver do not require an action nor bonus action to activate. For the attack, would both the flourish and maneuver apply should the player choose to use both resources?

Is it just down to a DM call?

Is there a creature that is resistant or immune to non-magical damage other than bludgeoning, slashing, and piercing?

Reading this question: Is there a distinction between magical damage and nonmagical damage?

I was wondering if there is a monster that is resistant or immune to non-magical damage other than the common bludgeoning, piercing, and slashing damage. For example, this monster might resist fire damage coming from a non-magical source, so using a torch might not be as effective as hurling a fire bolt at it.

Is there an example of such a creature?

Any damage resistance or immunity will do. If there is precedent or lore from an earlier edition that a creature has such a resistance/immunity, I would also welcome that information.

How can a Black Pudding split when damaged by lightning or slashing damage if it’s immune to such damage?

From DND Beyond entry on Black Pudding: (bold italics are mine)

Damage Immunities acid, cold, lightning, slashing

At the bottom of the stat block, under Reactions, it has the ability Split:

Split When a pudding that is Medium or larger is subjected to lightning or slashing damage, it splits into two new puddings if it has at least 10 hit points.

If it’s immune to lightning and slashing damage, how can it be ‘subjected’ to lightning or slashing damage in order to activate ‘Split’? It’s clear that ‘is subjected to’ means that it takes the damage. If you’re immune to something you by definition cannot be ‘subjected’ to it.