After intensive research into the principles of arcane magic, characters with two or more classes capable of casting arcane spells can begin to consolidate their powers into a single spell table and spellbook, by studying as a Master Arcanist. When this has been achieved, the Master Arcanist can add new spells to his spellbook as a Wizard does (if they appear on the spell lists for any of his arcane spellcasting classes) and can also learn to cast some of those without advance preparation, as a Sorcerer can.