Quote Originally Posted by VeryVoodoo View Post
Did the acc set bonuses come out at the same time when they released acc 5 quests on DMM? And if not, then when did the acc set bonuses release on DMM?
They release along with the lvl 90 rags. You unlock the accessory slots by getting the new material drops from those true rags, which have elements. Aka, since wind true rag releases first, your wind himes will be the first to get their 4th and 5th accessory slots.

The bonuses only unlock when you unlock all the accessory slots of a hime.