After clearing the quest 'Costume Enhancement,' You can increase your Hero's ability by enhancing the Costume.
■ Costume Upgrade
① Tap on 'Costume' in the Hero list.
② Select the Costume to enhance.
③ Tap on 'Enhance'.
④ To open the Costume's ability, you need to spend the Hero's Soulstone.
⑤ Basic Info: You can check additional ability information(Costume level, grade and ability.) for the current Costume.
⑥ Upgrade: You can attempt to level up the Costume.
⑦ Promote: You can increase the grade of the Costume.
⑧ Reset: You can reset the Costume's ability.
※ The guide was produced in a separate test environment.
So, It may change depending on the update and development situation.
Thank you for your love and interest in the Devil Book~
Devil Book Team