Same as you'd kill any old thing -- you hit it really hard until it dies. ( she says, with all the practiced confidence of someone who has killed a god. or the closest thing one can get to a god in her world. they're gearing up to kill another, too; it's not her fault azeroth has a bunch of them. ) Maybe it's a little more complicated -- Argus killed me once, after all -- but the gist is the same.

As for, um. Everyone who got brought back. They're not like, still dead but alive, are they? Only I've had enough of the undead to last a good long while if it's all the same to you.