Immediately granting all five items contained within upon opening, this bundle features select items from previous Immortal treasures that commemorate the history of The International. Each of these items features two styles: a default style that rethemes these Immortal hallmarks to match this year’s event, and a second style unlocked through playing that gives it an upgraded touch.
Source: http://blog.dota2.com/2018/07/the-promise-of-eminent-revival/