Farming Slate of Growth
By trading with ‘Fergus the Blacksmith’, you can get Slate of Growth by costing 1 log only.
After you get a Slate of Growth from him, finish him(catch or kill) and reset the map.
If you don’t know the value of SoG, please take a look of this video. It can status up your character (HP/MP/Stamina) up to 20 times.