The Champion, a chosen Hero, can be shared with player's friends. The purpose of the champion is to bring in an additional hero to execute a special move and change the tide of battle. The choice which Hero to share can be made in the Friends List. Using a friend's champion in a campaign dungeon battle will reward both you and your friend with 30 honor scrolls.
Your shared champion is selected by accessing Friend button in the town homepage. Within the Profile tab, clicking 'Change Champion' will bring up your list of available heroes to choose from.
A friend's Hero can be summoned once a day for free in a dungeon battle by tapping the yellow Hero icon at the right bottom of the dungeon screen. It is the silhouette of the hero against the yellow background. Clicking it will bring up the list of your Friends' heroes. Choosing one will briefly describe the ability of the hero and who it targets. The summoned Hero uses his/her special ability against the Enemies or supports the party, e.g. with a healing buff, etc.
Once a hero is used in a dungeon battle, subsequent summons for another hero within the same battle will cost gems. In addition, Gems are required to summon that same Hero again within 24 hours. This cooldown time reset automatically after 24 hours.
Both players recieve 30 Honor scrolls when the hero is summoned and used in battle. Honor scrolls are tallied up at the end of the dungeon run, and an ingame mail is sent to the owner of the hero to claim their scrolls.
Notes and Tips
To encourage other friends to use your champion in battle, choose a popular hero that does a lot of area attacks on the entire enemy party, or a hero that adds a buff to your entire party. In addition, keep it leveled up to your maximum player level.