Rule 814.1

Shield is a Passive Ability keyword.

• 814.1.a It is present on Units.
• 814.1.b Shield is formatted as "Shield [X]".
• 814.1.c It is functionally short for "While I am a defender, I have +X [M]."
• 814.1.d Being a defender means the Unit has gained the Defender designation during Combat. See rule 459. Combat for more…

Official Core Rules