13 hours ago, RaevenKS said:Are you sure about that ?
Impervious "trigger" if opponent has Pierce in his pool.
Immune: Pierce only say "Opponent can't cancel your block".
IMO, nothing state that both abilities do not stack.
EDIT : From Rule References
A defender with impervious rolls additional dice equal to the pierce x value in the attack pool, regardless of whether pierce is applied to the defender’s dice or to dice rolled by another unit using the guardian keyword during the attack
That’s specific to Guardian, and it’s a complete thought, you can’t cut it off before the conjunction of or and call it a day.