There is one particular method that effectively allows you to gain over 130,000 EXP per battle but it does take some work. Hardy Hands: Mount Huji, Laguna di Gondolia.
Liquid Metal Slime: Heliodor Region, Dundrasil Region, The Champs Sauvage, The Royal Library, The Battleground, Insula Orientalis.Metal Slime: Heliodor Region, Gallopolis Region, Dundrasil Region, Ruins of Dundrasil, The Champs Sauvage, Insula Orientalis.
