Back in the days of BC, we had a lot of guilds use something called "Item Caching" to predict when Warglaives would drop off Illidan in BC. They did this immediately after a server restart and then entered and reset multiple fresh Black Temple raids until the item <Warglaive> was linkable. When it was, it meant two things:
* Another rogue on the server who has glaives logged on, hence why this needed to be done ASAP
* IIllidan in a specific Black Temple save (normally the one you were in cause you should be the "only" guild trying this) will drop Warglaives as they are now cached by the server