Hi all. in the plot

If i play plot card Valar Morghulis in the plot phase and kill every character does that mean i can also play the response on Nimeria as an attachment and therefore save the character ? If so does the attachment then get discarded ?

Thanks in advance

Yes and no. You use the attachment to save the character it's attached to. Since the character survived, there's no need to discard Nymeria from play.

Thanks for the response and help.