Weird Guardian bug
Was playing through West Wing as the Sorceress when this happened:
I had heard the heard that some dwarves were killed. When I ran over to check it out, these two black shadows were just... on the floor. I tried reviving them with the Guardian Trinket, but it didn't do anything to these two.
So I have no idea why that happened. It was kind of funny though. If it helps, I think they were killed by a Water Lord.