Reincarnation Tower

The Reincarnation Tower is a recurring gameplay Event in Dislyte. It features a rogue-like challenge, where players are expected to use the event currency Wave Fragments to buy Espers for their team. All Espers collected this way will be removed after the challenge has been completed or failed, and players can start anew.
==Rules==
While each iteration of the event features slightly different rules, the core gameplay remains the same. Players cannot use their own Espers in combat. Instead, they will receive a certain amount of starting Wave Fragments to construct a team of 3 Espers first. Each victory earns a moderate amount of Fragments, while each loss will earn a small amount for consolation. As the player beats stages, their allies and their opponents team size will expand to 4 and eventually 5.
Generally, all Espers released up to the point of the event will be available in the pool to choose from. Each round before starting combat, the player will be offered a random selection of 5 Espers to choose from. The available Esper's rarity increases with progression: Only Rare Espers will be available for the first stage, while subsequent stages will offer Epic and eventually Legendary Espers as well. The available random selection can be refreshed in exchange for Wave Fragments, and Espers within the players inventory can also be returned for a small Fragment reimbursement. Picking the same Esper repeatedly will merge them, increasing their stats and unlocking additional Resonance levels (up to a limit).
Each iteration may have altered probabilities for the kind of Esper available, to further promote a new release or a certain team structure. 
In addition to this, each iteration features a set of goals for the player to reach in order to earn set rewards (such as beating the Tower a certain number of times or with certain Espers on their team).