Unarmoured Defence is a Monk passive feature that adds your Wisdom modifier to your 
Armour Class when not wearing armour or shields.
Description
Your reflexes are as effective as any armour. While not wearing armour, you add your Wisdom Modifier to your Armour Class.
How to learn
Classes:
- Class level 1: Monk
Notes
- This passive is disabled when
is applied. Similarly, it does not stack with Barbarian's 
; instead, only the higher of your Wisdom or Constiution modifier will be added to your AC. - Although the game just says both work "while not wearing armour", this feature does not appear to work when wearing shields, while the Barbarian version does.