SP can be invested in four statistics:
The effect of spending SP into these four statistics is different for each character class. Details are given in each of the main articles about the classes. Once spent, SP can only be transferred to other stats by resetting the SP distribution using the "forget" function in Forget Tree.
Before ver1.2 BETA, a player would be given 10 SP for every level gained. The 10 SP could be distributed amongst the 4 characters as the player pleases, allowing players to focus on one character while ignoring the other three.