Arcane Adept
An enterprising Sorcerer can choose to embrace study, much like a Wizard. Just as a Wizard may uncover latent sorcery and make the most of it. Arcane Adepts are able to cast spells either from their Bard, Wizard or Sorcerer repertoire, at the level of their highest arcane Class.
Ranks
Rank 1 - 1st-6th level spells use the caster level and DC calculation for the caster's highest level Arcane spell casting class (Bard, Sorcerer or Wizard).
Rank 2 - All spells use the caster level and DC calculation for the caster's highest level Arcane spell casting class (Bard, Sorcerer or Wizard), spell caps are increased by 5%.
Rank 3 - All spells use the caster level and DC calculation for the caster's highest level Arcane spell casting class (Bard, Sorcerer or Wizard), spell caps are increased by 10%.
Example: Sam is a level 5 Wizard and level 25 Sorcerer, with 20 Intelligence and 30 Charisma. Without Arcane Adept, if he cast Fireball from his Wizard spell selection, it would do 5d6 damage and have a DC of 18. If he cast Fireball as a Sorcerer, it would do 10d6 damage and have a DC of 23.
If Sam was an Arcane Adept, his Wizard-cast Fireballs would inherit the DC and caster level of his Sorcerer levels and Charisma bonus - becoming DC 23 and 10d6, identical to the ones he casts as a Sorcerer.