There are 2 guards near the entrance into the upper room in the elder council chambers building. One is dead and has the imperial palace key on him. No npc seems to mind it at all. Is it a bug or a quest from some mod? There are no monsters that could have killed him and, since it's the upper floor with no ladders, he couldn't have fallen from above.

What's with all the guards dropping dead in people's games all of a sudden? Has there been an outbreak of bubonic plague in Cyrodiil?

On topic, you wouldn't happen to be using Francesco's mod by any chance, Gnome2013?

No, I have many mods installed, but not this one. I have OOO though.