The githzerai +1 to AC stacks with Monk’s Unarmored Defense correct?That's correct. — Jeremy Crawford (@JeremyECrawford) September 11, 2017 Eladrin and gith—new race options to try—are the stars of this month's Unearthed Arcana:https://t.co/w3yi8AfC4B #DnD pic.twitter.com/V7igIsSsgg — Jeremy Crawford (@JeremyECrawford) September 11, 2017

@ChrisPerkinsDnD @mikemearls do the tortles in The Tortle Package receive Unarmored Defense benefits from monk and barbarian classes? — Alan Jackson (@ajacks003) September 16, 2017 No, they receive no AC bonuses ever. 👿 https://t.co/7RTIji46cn — Mike Mearls (@mikemearls) September 16, 2017 Whose executive decision was it to make Tortles a playable race NOT around April […]

@JeremyECrawford How does Tortle nat armor and Unarmored Defence (monk or barbarian) work? 17+(con or wis)? 10+dex+(c or w)? 10+(c or w)? — Shawn Banerjee (@ShawnBanerjee) September 16, 2017 If you have Natural Armor & Unarmored Defense, choose 1 to use. You don't use both. See SA Compendium for more: https://t.co/nlIvbEC7D7 #DnD https://t.co/vXfEujqtfL — Jeremy […]

does the gith ac bonus stack with unarmored defence or does it only effect the unarmored ac? or does it stack? — Teddy Ferguson (@TeddyFerguson20) September 12, 2017 When the game gives you a bonus, you get to use it unless you're already getting a bonus from something in the game with the same name. […]

@JeremyECrawford Cause I know I'm gonna get asked this, does the Stone's Durability stack with multiclassed Unarmored Defense? — Snowstorm.EXE (@Jackaraia) February 6, 2017 When you have more than one AC calculation that applies, you choose which one to use. #DnD https://t.co/1mGNbAi3vU — Jeremy Crawford (@JeremyECrawford) November 4, 2016

@BaptistaCarlosB @JeremyECrawfordCan a Lv9 Monk use Unarmored Movement to run non-stop through a large lake or a tower till its top w/o falling? you'd fall at the end of your turn #wotcstaff — (((Mike Mearls))) (@mikemearls) October 24, 2016