The title said it all
You must get 101 unique arks and hit the rewards place in Argamis
Check out lachzeers guide, it will help you get the 101 arks. And also, what i did is at the end of the game i checked my recipe thing and was amazed i could make so many new arks that shocked me, but helped.
U need to do the 101 arkadion quest but it is extremly hard i near end game n i only 85/101 SOOO CLOSE