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There are some spells and perks that require not having armor on to work, so how is armor defined?

Is it just any equippable gear that has additional AC? Is it anything more durable than regular fabric (like leather)?

Mechanically speaking, if I start wearing something that boosts my AC, like a single gauntlet, would that end Stone's Durability, Mage Armor, or Unarmored Defense?

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Armor refers to a set of armor

Armor is always referred to in sets. Taking the general description of Heavy Armor from the PHB (pg. 145):

Of all the armor categories, heavy armor offers the best protection. These suits of armor cover the entire body and are designed to stop a wide range of attacks.

Also Plate armor specifically, as an example, from the PHB (pg. 145):

Plate. Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor.

Finally, from PHB (pg. 146), the section on Getting Into and Out of Armor says this for donning armor:

Don. This is the time it takes to put on armor. You benefit from the armor's AC only if you take the full time to don the suit of armor.

From this, it appears to me as though armor is supposed to be worn as a suit, and wearing a single gauntlet wouldn't affect your AC at all.

Therefore, no, wearing a gauntlet won't end the Mage Armor spell or interfere with Unarmored Defense or anything like that, since it doesn't affect your AC.


As an aside, some playable races (such as Lizardfolk from Volo's Guide to Monsters) have "natural armor", and according to this answer to a question about natural armor and Unarmored Defense, natural armor isn't compatible with Unarmored Defense, Mage Armor, etc. as it calculates AC differently.

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    \$\begingroup\$ Perhaps a mention of the natural amour of certain races (which I believe also counts as "armour")? \$\endgroup\$ – PJRZ Oct 2 '18 at 9:37
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    \$\begingroup\$ I am not sure about Natural Armor counting as armor in general, the reason stated for it being incompatible with Unarmored Defense and Mage Armor is because it is a different "armor calculation" method. It is not clear to me that having some form of Natural Armor is incompatible with, say, the Monk's Unarmored Movement \$\endgroup\$ – Sdjz Oct 2 '18 at 10:02
  • \$\begingroup\$ @Sdjz. I don't currently have access to the books so didn't want to add my own answer without refs. But personally I would say "armor" is anything that says it is, well, armor! This includes anything listed under the Armor section in the PHB as per NathanS' answer, but also anything named "armor" that just provides a straightforward calculation for AC (like natural armor, which has "armor" right there in the name). This is opposed to, say, an item that just says it provides a +X bonus to AC. \$\endgroup\$ – PJRZ Oct 2 '18 at 10:07
  • \$\begingroup\$ @guest I'm glad you like my answer, but generally it's best to wait about 24h before accepting an answer to give people from different time zones a chance to answer, and you may prefer their answers to mine. When a question has an accepted answer, others are less likely to post their own answers. \$\endgroup\$ – NathanS Oct 2 '18 at 10:11
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    \$\begingroup\$ @PJRZ According to Jeremy Crawford "Having natural armor doesn't count as wearing armor." \$\endgroup\$ – Gandalfmeansme Oct 2 '18 at 13:45

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