I'm still fairly new to the game and I'm having trouble finding the information concerning the interaction between the Impervious and Immune:Pierce keywords.

Impervious says: While a unit with the impervious keyword is defending, it rolls a number of additional defense dice equal to the pierce x value of the attack pool.

Immune: Pierce says: While a unit with the immune: pierce keyword is defending, the attacker cannot use the pierce keyword to cancel block results on defense dice rolled by the defende r.

Sabine has Impervious and if she gets a darksaber, she also gains Immune: Pierce. Let's say she fights Luke - does it mean that she rolls 2 extra defense dice (since Luke has Pierce 2) on top of being Pierce immune? It sounds a bit ridiculous, but looking through the rules reference it's pretty clear that Immune: Pierce does not remove pierce keyword from the attack pool, it just means pierce cannot be used against that particular target (it can still be used against a guardian unit for example). What's the consensus on this? Has it been FAQed in some way?

It was supposed to be nixed by the FAQ, but it might have been overlooked iirc. Official responses have said that immune:pierce supercedes impervious.

Edit: Here you go

That's what I've been looking for! Thanks a lot man. I still think the wording could have been better on those, but at least it's cleared up.