You can enhance the equipment's stat options by using the Rune
① Tap on 'Rune'.
② Select the Rune for the equipment.
③ Check stat option change and upgrade the equipment.
④ When a Rune is granted, the Rune ability is added to the equipment.
(Rune can upgrade the stat option up to 110%.)
※ 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