Potent Spell Mastery

General Feat (Prerequisite: Level  8+,  Spell Mastery Feat)

Increase intelligence or Charisma ability score  by 1

Repeatable. No

Mental persuasion. Now when casting physchic spells you apply - Confusion Target must roll a percentile dice, they have a 50/ 50 change of hitting an ally or not attacking if there is no ally to hit. This percentile is increased in your favor by your caster level. 

E G. Susan is a level 10 Arcane Caster, she then changes the percentile roll to a 60/40 

60% they will attack an ally , 40% they won't