Ok I looked but didn't see this discussed anywhere. If your commander dies can you still use the command cards that they bring. IE Vader dies but I still have Implacable and New ways to motivate...or how ever they are worded....can I still use them or are they discarded? I understand that any bonuses that they would give Vader wont happen.

The commander-specific cards cannot be used once that commander is defeated. From page 20:

Quote

If a player’s commander is defeated, any commander-
specific command cards corresponding to that commander
cannot be played during the Command Phase.

Thanks...we had to of missed it when going through the rules.