Warbot Ignition Key



Warbot Ignition Key teaches you how to summon the Warbot companion. Filling it with Blue War Fuel or Red War Fuel will cause it to fight nearby Warbots filled with the opposing color.

Source
Players in the United States who signed up for the Choose Your Side promotion got this item (a Wonderworks toy) mailed to them by Jepetto Joybuzz. This item is still mailed to new characters on an account that has already signed up to receive it.

Those who did not sign up for the promotion were unable to obtain the item until patch 5.0.4, which made it available for from toy vendors (see below).

Pet Journal
A fighting robot fueled by delicious red or blue electrolytes.

Trivia

 * The Warbot appears as a common card for the Warrior class in the Goblins vs Gnomes expansion of Hearthstone. The flavor text reads: "Mass production of warbots was halted when it was discovered that they were accidentally being produced at "sample size.""