[RPG] Are there creatures that are immune to critical hits

critical-hitdnd-5emonsters

My thinking behind this is to do with the property of Adamantine Armour which states that "While you're wearing it, any critical hit against you becomes a normal hit" (DMG, p.150).

I wondered if there are any creatures that have this feature "naturally"? – possibly as a result of their skin/scales being so hard or because of another innate feature (but not spell-casting).

I am looking for answers with reference examples of creatures from the 5th edition in the officially published materials.

I'm not looking for a list per se but, if the prevalence of this feature in 5e is not exhaustive, then a list would be fine, too.

Best Answer

The Lord of Blades

From Eberron: Rising from the Last War, the Lord of Blades has the Adamantine Plating feature:

Adamantine Plating. Any critical hit against the Lord of Blades becomes a normal hit.

Notably, no creatures in the three monster books (MM, VGtM, MToF) have a similar feature.

Honorable Mention: Caduceus Clay, Grave Cleric

If you have watched Critical Role campaign 2, you will be familiar with the Grave Cleric’s 6th level feature Sentinel at Death’s Door:

At 6th level, you gain the ability to impede death’s progress. As a reaction when you or a creature you can see within 30 feet of you suffers a critical hit, you can turn that hit into a normal hit. Any effects triggered by a critical hit are canceled. (XGtE, p. 20)

It is not at all uncommon to see this exchange:

Matt (Dungeon Master): Natural 20 on the attack roll!

Taliesin (Caduceus Clay): CANCEL!

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