After spending years with their noses buried in books and their seats planted firmly in libraries, some wizards develop a knack for certain spells they have studied or cast repeatedly.
Beginning at 5th level, whenever a wizard gains access to a new spell level, she can choose a spell of up to the second highest level spell she can now cast. This spell is known as her intuitive spell. A wizard can cast an intuitive spell a number of times per day equal to her Charisma modifier without preparing it or using up a spell per day. Temporary increases or decreases to Charisma do not affect the number of times per day a wizard can cast her intuitive spells. Once a wizard chooses an intuitive spell, she cannot change it. This spell cannot be modified by metamagic feats or abilities. The intuitive spell cannot be from the wizard’s opposition schools. This spell is otherwise treated exactly like any other spell the wizard casts. This is in addition to the spell a wizard can cast spontaneously from a bonded item.
For example, Reid, a 7th level wizard, can now choose a spell of up to 3rd level (the second highest spell level he can cast) as an intuitive spell. He chooses fireball. Because Reid has a Charisma score of 14 (+2 modifier) he can now cast fireball twice a day without preparing it ahead of time. This is in addition to his 1st and 2nd level intuitive spells, each of which he can also cast twice a day.
Intuitive wizardry replaces all the powers granted by arcane schools, including the universal school.