Shield

Shield is a Static Ability keyword present on Units.

Shield is formatted as "Shield [X]", where X is referred to as the Shield Value.

If X is omitted, it is presumed to be 1.

It is functionally short for "While I am a defender, I have +X [S]."

Shield remains in effect as long as the Unit maintains the Defender designation.

If a Unit is granted Shield by an additional source, the Shield Value of all granted Shield keywords is summed.

Shield, and whether or not a unit has Shield, is a characteristic of the Unit and may be checked or referenced by other Game Effects.