Chameleon Carapace. While you aren’t wearing armor, your carapace gives you a base Armor Class of 13 + your Dexterity modifier. As an action, you can change the color of your carapace to match the color and texture of your surroundings, giving you advantage on Dexterity (Stealth) checks made to hide in those surroundings.
Monk Has:
Unarmored Defense
Beginning at 1st level, while you are wearing no armor and not wielding a shield, your AC equals 10 + your Dexterity modifier + your Wisdom modifier.
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.
No, they do not. You may only use one armor calculation, whether it's the Barbarian or Monk's unarmored defense, some form of Natural Armor such as the Chameleon Charapace, Mage Armor, actual physical armor, etc.
You may add armor bonuses such as a shield, Bracers of Defense, etc on top of your base armor calculation as long as the item's requirements are met (ex: you can't use Bracers of Defense with a suit of armor, but you can with Mage Armor).
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i was wondering about this.
a thri kreen has :
Monk Has:
Unarmored Defense
Beginning at 1st level, while you are wearing no armor and not wielding a shield, your AC equals 10 + your Dexterity modifier + your Wisdom modifier.
do they stack?
You choose between them which one to calculate AC
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.
No, they do not. You may only use one armor calculation, whether it's the Barbarian or Monk's unarmored defense, some form of Natural Armor such as the Chameleon Charapace, Mage Armor, actual physical armor, etc.
You may add armor bonuses such as a shield, Bracers of Defense, etc on top of your base armor calculation as long as the item's requirements are met (ex: you can't use Bracers of Defense with a suit of armor, but you can with Mage Armor).