itch.io

Well i am aware that it lets you use the op attack, is the ending where you use it on the big G what "illusion sana" is alluding to ?

SPOILERS AHEAD*****

its part of a chain quest when you get to the demon's city to the right of the door from inside you will see a man standing between two buildings but remember that the man wont appear if you JUST got into the city it will appear some time later not sure if you have to defeat gustav or not for it to appear

**all that is a copy paste from my reply to the comment from above