Yep, that's exactly right on both counts! Evil sorcerers tend to revive them, though they're really just shells of who they used to be, if that.

[For a moment, she's a little uncomfortable, thinking about the Deadlords. They'd....spoken, hadn't they? They'd even had some similarities to--

No, it's fine. It had to be nothing, really.]

But because they just keep reviving soldiers over and over again, it's a liiiittle important that we stop them at the source.