Where to use Ares Phantacite

Hi, i have some ares phantacite, but i dunno where to exchange them! Do u know where i must go?

Right now, there is no use for them since they were originally used to trade for Old Type versions of the Ares weapons, which are not in the Global version; they do still have a use, but it will not be until we have 15* weapons.

Ah i see, thx!