Basic addon that checks completed quests against a dump of the discovery quest database, looking for missing Carnage quests.
Sadly, there's no easy way to work out in which Carnage quest you're missing when you're staring at a 28/29 completion total. This addon attempts to fill that gap by listing out which carnage quests haven't been completed, or picked up, in a particular zone. Additionally, the objective text is printed out for each missing Carnage quest.
/carnage Open up the Carnage Book UI.
Use the drop down top left to select a zone.
Select any quest listed down the left to show further information on the right.
Filter the quests with the checkboxes top right.