Spell Skill.
Sorc/Wizard/Bard: Each school becomes part of a spell casters spell list. When a spell caster cast a spell then you make a skill check equal to 10+1+spell level. Each time you cast a spell from that skill the total DC increases by 1+Spell level. Specialized wizards gain +4 on all rolls for that skill.
Devine: All spells are based of one spell skill [Devine] and you get +4 to spells Spontaneously casted. [Any druid spell, or a Cleric's Cure light wound] Paladins and Rangers gain this skill at 4th level.
Wu Jen: As Wizard which is treated as a Specialized, Spell school is which element the Wu Jen can cast. Multiple Elements are there own spell skill.
Note:
Caster retain spell known and highest spell possible.
When casting a Universal spell, you can pick which skill to base it off of. They do not add the +1 to the DC.
Meta magic no longer increase the spell level. When rolling a spell check if the total beats the total DC by 10, then the it does not permanently increase the DC for that skill. If you do not beat the DC then it is permanently doubled. (For example, if you quicken a fireball then failing to beat the DC increase it by 8 rather then four. )
Spell casters can at any time use the total of bonus spells per day to lower the spell skill dc by any number of how many points. This applies to each skill separately. (For example, if Joe the Sorc has 5 bonus spells then he can ether choose to decrease one spell skill by five, or two by 2 and one by 1.)
Other DC such as casting Defensively apply to casting the spell, but do not increase the DC after the casting.
Failing to beat the DC makes the caster lose being able to cast spells from that skill.
Invocations: Non spell casters can practice a single spell over and over again to attempt to be bale to cast it as a spell like ability. To gain a Invocation you treat the spell you want as a cross class skill (Non caster have to treat spell skills for the spell name) and make DC equal to 20+Spell level+ability score modifier of the caster.
