FOMO: "Fear Of Missing Out", also commonly known as people with a mental issue of managing time and activities, many expecting others to fit into their schedule so they don't miss out on things to come. If FOMO becomes a problem for you, do seek help, it can be a very unhealthy lifestyle..
Here you go. Curated by the lovey lore nerds at BlizzardWatch.
Presented in chronological order
http://blizzardwatch.com/warcraft-lore-books-guide/
Illidan goes from the WoA novel to TBC and the events taken at BT while we're out killing other guys in outland. However, the end of the novel does lead into legion. However, I did put it above arthas because arthas basicly talks about the WC3 events, while Illidan is MAINLY focused on the events of black temple.