True Magus

At 20th level, the magus becomes a master of spells and combat. Whenever he uses his spell combat ability, he does not need to make a concentration check to cast the spell defensively. Whenever the magus uses spell combat, he can choose to either increase the DC to resist his spells by 2, grant himself a +2 circumstance bonus on any checks made to overcome spell resistance, or grant himself a +2 circumstance bonus on all attack rolls.