With the announcement of the release date of World of Warcraft: Legion, the clock started ticking on your opportunity to complete Warlords of Draenor Challenge Modes and earn sweet, sweet rewards such as the Challenger’s War Yeti mount for beating all of the silver times or access to unique transmogrification weapons for beating all of the gold times.
If you complete all of the Gold times with a party of your guildmates, you unlock access to the Deathwatch Hatchling pet for your entire guild. It’s not easy, but nothing worthwhile ever is!