Mana Board is a feature through which you can raise your unit's performance.
Each unit has a different Mana Board and different ability performances.
You can use training items and Mana to learn abilities and grow your unit,
and unlock unit episodes to view a unit's story.
You can strengthen all skills and learn all abilities from the Mana Board to evolve your unit,
and unlock and raise all options including unit episodes to their maximum level to acquire "Amity Scrolls."
"Amity Scrolls" are used as a currency to be exchanged for armaments at the shop.
In a Mana Board, there is a space to which you can equip Ability Cores.
Equip the Ability Cores that can be acquired upon awakening/melting down an armament to the Mana Board
to gain additional abilities.
You can always take the equipped Ability Core
and turn it into another armament's Ability Core by using Wrightpieces.
Try gathering as much training items and Mana as possible to make your unit stronger.