The Keepers' Tower is a subsection of the Keepers' Stronghold, and contains rooms dedicated to Monster battling.
Champion Challenge[]
Champion ChallengeThe Champion Challenge allows you to rebattle defeated Champion Monsters. Achieving a higher star rating (regardless of difficulty) will give you any rewards that you missed out when you fought the Champion for the first time.
Duel Circle[]
Duel CircleThe Duel Circle is unlocked after achieving the rank of Keeper Novice. In this room, Duel Trainer Gotthelm explains to you the rules of Keeper Duels and you can battle against him in a Duel Challenge. In the story, your fight with Will is here.
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Infinity Arena[]
Infinity ArenaThe Infinity Arena is unlocked after achieving the rank of Keeper Seeker. This room is where you are matched against three random Monsters. This continues until you lose or give up. The more battles you complete, the stronger the opposing Monsters in the next fight will be. Your Monsters also get stronger every turn so as to not make battles last forever.
Online Arena[]
Online ArenaThe Online Arena is unlocked after achieving the rank of Keeper Lancer. This room allows you to battle against other players online. You can also view the leaderboard of the current season.
Eternity's End[]
The Eternity's End is a secret area at the top of the tower, unlocked after achieving the rank of Keeper Master. This area allows you to obtain the Spectral Familiars and a special accessory once you defeat them in a battle.