Lost Okina is the optional boss of Heaven, found on the last floor and appears on November 20th. It does not have to be fought in order to proceed in the storyline. While it has nothing flagged as a Weakness it takes the same amount of damage as it would if it were (125%) against all the attributes that it doesn't resist. Defeating it grants the party access to the Chakra Ring accessory at the end of the bridge by the left pillar and increases the protagonist's Courage statistic.