This will bring up a popup window which will give you the correct answer along with some additional statistics. Leaderboards and highlights on fantasy teams will be displayed at both the International website and at the event its self. The Team Profiles section of the compendium gives you information about the the teams in The International such as their country of origin and past team accomplishments. These can be activated in the exact same manner as the comependium itself. This scenario is changed every week and you can find all the info about it in the newly added pages in your Compendium. Some of them will even provide a link to the relevant game replay. Your selections will also appear on your compendium icon whenever somebody looks at your Dota 2 Profile.
Once you've activated the compendium, any stretch goal rewards such as the battle booster will be automatically placed into your backpack.
Please see the instructions page for reasons why this item might not work within Dota 2. For more information on Player Cards check out Cyborgmatt's guide below. This information varies depending on what team you are playing for. At any point you'd like to close the compendium you can click the button at the bottom labeled close. Unlocks the ability to vote on which hero should receive the next Arcana.