Make use of Hexerei Tower
It is a map you can enter by using the item "Hexerei Key".You can receive large amount of Exp, Rugia, and Stat Ball by clearing.
-About Hexerei Tower Key
Hexerei Tower Key -Darkness Alter-
You can enter mission -Darkness Alter- where you can gain large amount of Exp.
Hexerei Tower Key -Golden Shrine-
You can enter mission -Golden Shrine- where you can gain large amount of Rugia.
Hexerei Tower Key -Abyss Coliseum-
You can enter mission -Abyss Coliseum- where you can gain large amount of Stat Ball.
-How to obtain Hexerei Tower Key
-Reward for clearing certain Quest.-Reward for fulfilling certain Achievement.
-Reward for defeating Mission Boss.
*You may not receive it in certain occasion.
-Reward for clearing Phantasma World.
-From Dream Key Box you can produce from Seeker Judas.
-Purchase from Item Shop.
*There may be time it is not on sale.