Armor - DND 5th Edition
Your class gives you proficiency with certain types of armor. If you wear armor that you lack proficiency with, you have disadvantage on any ability check, saving throw, or Attack roll that involves Strength or Dexterity, and you can’t cast Spells.
Medium Armor Master - DND 5th Edition
Medium Armor Master. Source: Player's Handbook. Prerequisite: Proficiency with medium armor. You have practiced moving in medium armor to gain the following benefits: Wearing medium armor doesn't impose disadvantage on your Dexterity (Stealth) checks.
Moderately Armored - DND 5th Edition
Moderately Armored. Source: Player's Handbook. Prerequisite: Proficiency with light armor. You have trained to master the use of medium armor and shields, gaining the following benefits: Increase your Strength or Dexterity score by 1, to a maximum of 20.
Magic Items: Armor - DND 5th Edition
Journeys through the Radiant Citadel. KGV. Keys from the Golden Vault. LLK. Lost Laboratory of Kwalish. LMP. Lost Mine of Phandelver. MOT. Mythic Odysseys of Theros.
Heavily Armored - DND 5th Edition
Heavily Armored. Source: Player's Handbook. Prerequisite: Proficiency with medium armor. You have trained to master the use of heavy armor, gaining the following benefits: Increase your Strength score by 1, to a maximum of 20. You gain proficiency with heavy armor.
Warforged Features (UA) - DND 5th Edition
Your body has built-in defensive layers, which determine your armor class. You gain no benefit from wearing armor, but if you are using a shield, you apply its bonus as normal.
Mithral Armor - DND 5th Edition
Armor (medium or heavy), uncommon. Mithral is a light, flexible metal. A mithral chain shirt or breastplate can be worn under normal clothes. If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn't.
Artificer: Armorer - DND 5th Edition
An artificer who specializes as an Armorer modifies armor to function almost like a second skin. The armor is enhanced to hone the artificer's magic, unleash potent attacks, and generate a formidable defense.
Artificer: Battle Smith - DND 5th Edition
Medium construct Armor Class: 15 (natural armor) Hit Points: 2 + your Intelligence modifier + 5 times your artificer level (the defender has a number of Hit Dice [d8s] equal to your artificer level)
Warforged - DND 5th Edition
Your body has built-in defensive layers, which can be enhanced with armor. You gain a +1 bonus to Armor Class. You can don only armor with which you have proficiency.