by a1bert
From the rulebook:Rules, page 22. wrote:
Example: an Attack 3 PIERCE 2 ability used on a monster with Shield 3 would ignore two of
the monster’s Shield points and inflict 2 damage (modified by an attack modifier card).
the monster’s Shield points and inflict 2 damage (modified by an attack modifier card).
Pierce 2 ignores 2 Shields, 1 Shield remains.
1 Shield cancels 1 of the 3 attack value, thus resulting in 2 damage.