Spelljammer Trying to build a Thri-Kreen Swarmkeeper Ranger

ElterAgo

Explorer
Anyone know if the thri-kreen's natural armor would stack with a barbarian's unarmored defense. Was thinking of taking a dip into barbarian.
 

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pukunui

Legend
Not saying you are wrong, but can you tell me where I can find that rule?
A person in our group thinks it should stack. GM hasn't weighed in on the discussion yet.
It's a well established fact. Here's the relevant bit from the Sage Advice Compendium:

How do you calculate a creature’s Armor Class (AC)?
Chapter 1 of the Player’s Handbook (p. 14) describes how to determine AC, yet AC calculations generate questions frequently. That fact isn’t too surprising, given the number of ways the game gives you to change your AC!

Here are some ways to calculate your base AC:
Unarmored: 10 + your Dexterity modifier.
Armored: Use the AC entry for the armor you’re wearing (see PH, 145). For example, in leather armor, you calculate your AC as 11 + your Dexterity modifier, and in chain mail, your AC is simply 16.
Unarmored Defense (Barbarian): 10 + your Dexterity modifier + your Constitution modifier.
Unarmored Defense (Monk): 10 + your Dexterity modifier + your Wisdom modifier.
Draconic Resilience (Sorcerer): 13 + your Dexterity modifier.
Natural Armor: 10 + your Dexterity modifier + your natural armor bonus. This is a calculation method typically used only by monsters and NPCs, although it is also relevant to a druid or another character who assumes a form that has natural armor.

These methods—along with any others that give you a formula for calculating your AC—are mutually exclusive; you can benefit from only one at a time. If you have access to more than one, you pick which one to use. For example, if you’re a sorcerer/monk, you can use either Unarmored Defense or Draconic Resilience, not both. Similarly, a druid/barbarian who transforms into a beast form that has
natural armor can use either the beast’s natural armor or Unarmored Defense (you aren’t considered to be wearing armor when you use natural armor).

What about a shield? A shield increases your AC by 2 while you use it. For example, if you’re unarmored and use a shield, your AC is 12 + your Dexterity modifier. Keep in mind that some AC calculations, such as a monk’s Unarmored Defense, prohibit the use of a shield.

Once you have your base AC, it can be temporarily modified by situational bonuses and penalties. For instance, having half cover gives you a +2 bonus to your AC, and three-quarters cover gives a +5 bonus. Spells sometimes modify AC as well. Shield of faith, for example, grants a
target a +2 bonus to AC until the spell ends.
Magic items can also enhance your AC. Here are a few examples: +1 chain mail gives you an AC of 17, a ring of protection gives you a +1 bonus to AC no matter what you’re wearing, and bracers of defense grant you a +2 bonus to AC if you’re not wearing armor or using a shield.
Emphasis mine.
 


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