The following is a supernatural ability of Level 5 if we were to compare it to spell level and can be unlocked at level 10. Is from the vestige Dantalion of the Pact Magic system from the Tome of Magic.
Read Thoughts: At will as a full-round action, you can attempt to read the surface thoughts of any creature you can see, as long as it is within 5 feet per effective binder level you possess. If the target makes a successful Will save, you cannot read its thoughts for 1 minute.
Creatures of animal intelligence (Int 1 or 2) have simple, instinctual thoughts that you can pick up. If you attempt to read the thoughts of a creature with an Intelligence score 10 points higher than your own, you automatically fail and are stunned for 1 round. You can read a creature’s thoughts for as long as you concentrate.
Effective binder level is like the caster level, in this case refers to level of the Binder Class.
I was thinking in giving the caster damage reduction 30/adamantine that absorbs 10 points of melee damage per two effective binder levels if the target fails the save, like premonition but with less power. And if the caster gets away to far from the target, the effect ends.